This provides a decent speedup:
```
$ hyperfine 'git checkout master; brew help' 'git checkout help_bash; brew help'
Benchmark 1: git checkout master; brew help
Time (mean ± σ): 506.4 ms ± 50.9 ms [User: 223.7 ms, System: 99.9 ms]
Range (min … max): 454.6 ms … 634.1 ms 10 runs
Benchmark 2: git checkout help_bash; brew help
Time (mean ± σ): 109.5 ms ± 57.1 ms [User: 1
```
and compares favourably to `pip3 help`:
```
$ hyperfine 'brew help' 'pip3 help'
Benchmark 1: brew help
Time (mean ± σ): 72.9 ms ± 15.9 ms [User: 4.9 ms, System: 6.3 ms]
Range (min … max): 53.6 ms … 126.6 ms 31 runs
Benchmark 2: pip3 help
Time (mean ± σ): 171.5 ms ± 6.1 ms [User: 131.6 ms, System: 24.7 ms]
Range (min … max): 164.2 ms … 189.3 ms 15 runs
Summary
brew help ran
2.35 ± 0.52 times faster than pip3 help
```
Take 2 of https://github.com/Homebrew/brew/pull/17692 but with:
- provide and document `HOMEBREW_NO_VERIFY_ATTESTATIONS`
- don't try to run unless there's GitHub credentials
- don't try to run unless `gh` is installed
- don't try to run in CI
While we're here:
- split out a `Homebrew::EnvConfig.devcmdrun?` helper method
- add some missing `Homebrew::EnvConfig.github_api_token` presence
checks
Let's use the disable date, if provided, and use 1 year after the
deprecation date otherwise, to display a better message for the
various outputs of deprecated package messages.
Also, provide an internal API for this that can be used by
Homebrew/actions.
A recent commit reworked `require`s to improve performance but this
led to an `uninitialized constant Homebrew::DevCmd::Bump::Repology`
error in `brew bump`. This adds a `utils/repology` `require` to
`dev-cmd/bump.rb` to resolve the error.
This improves the load time of most brew commands. For an example of
one of the simplest commands this speeds up:
Without Bootsnap:
```
$ hyperfine 'git checkout master; brew help' 'git checkout optimise_requires; brew help'
Benchmark 1: git checkout master; brew help
Time (mean ± σ): 525.0 ms ± 35.8 ms [User: 229.9 ms, System: 113.1 ms]
Range (min … max): 465.3 ms … 576.6 ms 10 runs
Benchmark 2: git checkout optimise_requires; brew help
Time (mean ± σ): 383.3 ms ± 25.1 ms [User: 133.0 ms, System: 72.1 ms]
Range (min … max): 353.0 ms … 443.6 ms 10 runs
Summary
git checkout optimise_requires; brew help ran
1.37 ± 0.13 times faster than git checkout master; brew help
```
With Bootsnap:
```
$ hyperfine 'git checkout master; brew help' 'git checkout optimise_requires; brew help'
Benchmark 1: git checkout master; brew help
Time (mean ± σ): 386.0 ms ± 30.9 ms [User: 130.2 ms, System: 93.8 ms]
Range (min … max): 359.5 ms … 469.3 ms 10 runs
Benchmark 2: git checkout optimise_requires; brew help
Time (mean ± σ): 330.2 ms ± 32.4 ms [User: 93.4 ms, System: 73.0 ms]
Range (min … max): 302.9 ms … 413.9 ms 10 runs
Summary
git checkout optimise_requires; brew help ran
1.17 ± 0.15 times faster than git checkout master; brew help
```
Add the (for now undocumented) `HOMEBREW_NO_VERIFY_ATTESTATIONS` to
disable attestation verification if it's having issues or when doing
development.
While we're here, do a little style cleanup too.
