Instrument ActiveStorage analyzers

[shouichi]

Summary

This PR adds instrumentations to ActiveStorage analyzers so that the time of analysis can be tracked.

Close #42930.

Other Information

The following things should be agreed upon before merging.

• Name of the instrumentation event
  • Currently analyzer.active_storage but should we include analyzer name? Changed to analyze.active_storage so that it is consistent with others.
• Extra payload to attach (not sure if there any.)
  • Add analyzer name.

Also, we may want to add the new event to the active support instrumentation document.

Thanks.

[p8]

This looks great! Can you rebase and add a Changelog entry?

[p8]

Could you also add it to the guides? 🙏
https://edgeguides.rubyonrails.org/active_support_instrumentation.html#active-storage

[shouichi]

Hi, @p8 thanks for the review!

Rebased and made the following changes.

• Changed event name to analyze.active_storage so that it is consistent with others (e.g., transform.active_storage).
• Added tests to check if a payload contains an analyzer name.
• Added CHANGELOG
• Added the new event to the active support instrumentation guide.

[p8]

Could you also rebase on main to hopefully fix the unrelated spelling warnings?

[shouichi]

Rebased 👍

[p8]

Thanks! The build failures seem unrelated :/