Add OTEL collector code

otel/.gitignore

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+collector/components.go
+collector/go.mod
+collector/go.sum
+collector/main.go
+collector/main_others.go
+collector/main_windows.go
+collector/profiling-collector
+ocb

otel/README.md

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+The collector code is just meant as an example.
+The receiver code needs to use the OTEL profiling API, once that is available.
+Technically, the receiver and collector code can both live in separate repositories.
+
+
+To get the `ocb` tool (OTEL collector builder, amend version):
+```
+curl --proto '=https' --tlsv1.2 -fL -o ocb https://github.com/open-telemetry/opentelemetry-collector/releases/download/cmd%2Fbuilder%2Fv0.104.0/ocb_0.104.0_linux_amd64
+chmod a+x ocb
+```
+
+To build a static version of the collector with glibc
+```
+./ocb --skip-strict-versioning --verbose --config builder-config.yaml
+```
+
+To build a static version of the collector with muslc (on x86/amd64)
+```
+CC=x86_64-linux-musl-gcc \
+CGO_ENABLED=1 \
+./ocb --skip-strict-versioning --verbose --config builder-config.yaml \
+  --ldflags="-linkmode external -extldflags=-static"
+```
+
+Run the collector (start devfiler first)
+```
+sudo collector/profiling-collector --config collector/config.yaml
+```

otel/builder-config.yaml

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+dist:
+  name: profiling-collector
+  description: Profiling OTel Collector distribution
+  output_path: ./collector
+  otelcol_version: 0.104.0
+
+exporters:
+  - gomod:
+      go.opentelemetry.io/collector/exporter/debugexporter v0.104.0
+  - gomod:
+      go.opentelemetry.io/collector/exporter/otlpexporter v0.104.0
+
+processors:
+  - gomod:
+      go.opentelemetry.io/collector/processor/batchprocessor v0.104.0
+
+receivers:
+  - gomod:
+      go.opentelemetry.io/collector/receiver/otlpreceiver v0.104.0
+  - gomod:
+      github.com/elastic/otel-profiling-agent v0.0.0-20240717140952-d386d2702214
+    import: github.com/elastic/otel-profiling-agent/otel/receiver
+    name: profilingreceiver

otel/collector/config.yaml

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+receivers:
+  otlp:
+    protocols:
+      grpc:
+        endpoint: 0.0.0.0:4317
+  otelreceiver: # this line represents the ID of your receiver
+    project-id: 123
+    collection-agent: 127.0.0.1:11000
+    verbose: true
+    disable-tls: true
+    secret-token: abc123
+
+processors:
+  batch:
+
+exporters:
+  debug:
+    verbosity: detailed
+#  otlp/jaeger:
+#    endpoint: localhost:14317
+#    tls:
+#      insecure: true
+
+service:
+  pipelines:
+    traces:
+      receivers: [ otlp, otelreceiver ]
+      processors: [ batch ]
+      exporters: [ debug ]
+  telemetry:
+    logs:
+      level: debug