docs: proto generation scripts (cosmos#11133)

## Description

+ Updates proto generation scripts
+ adds more docs on how to install protoc dependencies

---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

go.mod

@@ -50,7 +50,7 @@ require (
 	github.com/tendermint/tendermint v0.35.1
 	github.com/tendermint/tm-db v0.6.6
 	golang.org/x/crypto v0.0.0-20220112180741-5e0467b6c7ce
-	google.golang.org/genproto v0.0.0-20211208223120-3a66f561d7aa
+	google.golang.org/genproto v0.0.0-20220118154757-00ab72f36ad5
 	google.golang.org/grpc v1.44.0
 	google.golang.org/protobuf v1.27.1
 	pgregory.net/rapid v0.4.7
@@ -87,6 +87,7 @@ require (
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/snappy v0.0.4 // indirect
 	github.com/google/btree v1.0.1 // indirect
+	github.com/google/go-cmp v0.5.7 // indirect
 	github.com/google/orderedcode v0.0.1 // indirect
 	github.com/google/uuid v1.3.0 // indirect
 	github.com/googleapis/gax-go/v2 v2.1.1 // indirect

go.sum

@@ -550,8 +550,9 @@ github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
 github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.7 h1:81/ik6ipDQS2aGcBfIN5dHDB36BwrStyeAQquSYCV4o=
+github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE=
 github.com/google/gofuzz v0.0.0-20170612174753-24818f796faf/go.mod h1:HP5RmnzzSNb993RKQDq4+1A4ia9nllfqcQFTQJedwGI=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/gofuzz v1.1.1-0.20200604201612-c04b05f3adfa h1:Q75Upo5UN4JbPFURXZ8nLKYUvF85dyFRop/vQ0Rv+64=
@@ -1927,8 +1928,9 @@ google.golang.org/genproto v0.0.0-20211118181313-81c1377c94b1/go.mod h1:5CzLGKJ6
 google.golang.org/genproto v0.0.0-20211129164237-f09f9a12af12/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
 google.golang.org/genproto v0.0.0-20211203200212-54befc351ae9/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
 google.golang.org/genproto v0.0.0-20211206160659-862468c7d6e0/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
-google.golang.org/genproto v0.0.0-20211208223120-3a66f561d7aa h1:I0YcKz0I7OAhddo7ya8kMnvprhcWM045PmkBdMO9zN0=
 google.golang.org/genproto v0.0.0-20211208223120-3a66f561d7aa/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
+google.golang.org/genproto v0.0.0-20220118154757-00ab72f36ad5 h1:zzNejm+EgrbLfDZ6lu9Uud2IVvHySPl8vQzf04laR5Q=
+google.golang.org/genproto v0.0.0-20220118154757-00ab72f36ad5/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
 google.golang.org/grpc v1.8.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=

scripts/protocgen.sh

@@ -1,17 +1,35 @@
 #!/usr/bin/env bash
 
-set -eo pipefail
+#== Requirements ==
+#
+## make sure your `go env GOPATH` is in the `$PATH`
+## Install:
+## + latest buf (v1.0.0-rc11 or later)
+## + protobuf v3
+#
+## All protoc dependencies must be installed not in the module scope
+## currently we must use grpc-gateway v1
+# cd ~
+# go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+# go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+# go install github.com/grpc-ecosystem/grpc-gateway/[email protected]
+# go install github.com/cosmos/cosmos-proto/cmd/protoc-gen-go-pulsar@latest
+# go get github.com/regen-network/cosmos-proto@latest # doesn't work in install mode
 
-protoc_gen_gocosmos() {
-  if ! grep "github.com/gogo/protobuf => github.com/regen-network/protobuf" go.mod &>/dev/null ; then
-    echo -e "\tPlease run this command from somewhere inside the cosmos-sdk folder."
-    return 1
-  fi
+set -eo pipefail
 
-  go get github.com/regen-network/cosmos-proto/protoc-gen-gocosmos@latest 2>/dev/null
+protoc_install_gocosmos() {
+  echo "Installing protobuf gocosmos plugin"
+  # we should use go install, but regen-network/cosmos-proto contains
+  # replace directives. It must not contain directives that would cause
+  # it to be interpreted differently than if it were the main module.
+  # So the command below issues a warning and we are muting it for now.
+  #
+  # Installing plugins must be done outside of the module
+  (cd ~; go get github.com/regen-network/cosmos-proto/[email protected] 2> /dev/null)
 }
 
-protoc_gen_gocosmos
+protoc_install_gocosmos
 
 echo "Generating gogo proto code"
 cd proto

scripts/protocgen2.sh

@@ -1,15 +1,13 @@
-
-
 # this script is for generating protobuf files for the new google.golang.org/protobuf API
 
 set -eo pipefail
 
-protoc_gen_gopulsar() {
-  go install github.com/cosmos/cosmos-proto/cmd/protoc-gen-go-pulsar@latest 2>/dev/null
-  go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest 2>/dev/null
+protoc_install_gopulsar() {
+  go install github.com/cosmos/cosmos-proto/cmd/protoc-gen-go-pulsar@latest
+  go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
 }
 
-protoc_gen_gopulsar
+protoc_install_gopulsar
 
 echo "Generating API module"
 (cd proto; buf generate --template buf.gen.pulsar.yaml)