Add require: false to lesser used gems in our Gemfile

[dkniffin]

require: false tells bundler to install a gem, but not require it automatically (more info]. This is good for gems that you don't always want to include. For example, we only need to require rubocop when rubocop is running (not during the runtime for the app, or even during tests). By not requiring it, we should save some boot time of our apps

[prawl]

Interesting, do we have any numbers of the boot time saved by not requiring a gem?

[dkniffin]

@prawl I don't have any metrics. We should do a little testing on this before we implement this

Also, jw, are you going to continue using/contributing to this now that you've left SB?

[dkniffin]

This gem will be good for benchmarking the difference of this: https://github.com/schneems/derailed_benchmarks