chore: Document emitted events

[jsumners-nr]

While working on #2548 I needed to understand when some events are firing and learned that we do not have any documentation around events. Ideally, we'd have a document that outlines the common event sequences, but I don't have that picture right now. What this PR includes is jsdoc for almost every event the codebase generates. There is a whole class events in the Config namespace that I could not document. These events are emitting events named after configuration keys. There are two problems here:

1. It's not clear what the event names will actually be. As an example, what would be fired if enabled from { feature_name: { enabled: true } } is changed to false? Would the event name be enabled, feature_name, or something like feature_name.enabled?
2. There's no way to document dynamic event names with jsdoc. At least no way that I can think of that would really clarify anything.

Also, this PR changes the events around data sending. The current event names are like starting error_data data send.. This PR changes them to starting_data_send-error_data. We can't document event names with spaces, and other non-alphanum characters, in them. Indeed, it was a bit of a challenge to find a separator character to separate the prefix and actual event name that jsdoc would handle correctly.

So, while not everything is fully documented, I think the PR puts us in a better position than before.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.22%. Comparing base (0b07be8) to head (e33cf26).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2561      +/-   ##
==========================================
+ Coverage   97.19%   97.22%   +0.03%     
==========================================
  Files         289      290       +1     
  Lines       45448    45882     +434     
==========================================
+ Hits        44172    44608     +436     
+ Misses       1276     1274       -2     

Flag	Coverage Δ
integration-tests-cjs-18.x	74.07% <99.51%> (+0.25%)	⬆️
integration-tests-cjs-20.x	74.08% <99.51%> (+0.26%)	⬆️
integration-tests-cjs-22.x	74.12% <99.51%> (+0.26%)	⬆️
integration-tests-esm-18.x	49.71% <97.83%> (+0.52%)	⬆️
integration-tests-esm-20.x	49.71% <97.83%> (+0.52%)	⬆️
integration-tests-esm-22.x	49.74% <97.83%> (+0.52%)	⬆️
unit-tests-18.x	88.86% <99.75%> (+0.10%)	⬆️
unit-tests-20.x	88.86% <99.75%> (+0.10%)	⬆️
unit-tests-22.x	88.87% <99.75%> (+0.10%)	⬆️
versioned-tests-18.x	79.08% <97.83%> (+0.09%)	⬆️
versioned-tests-20.x	79.06% <97.83%> (+0.06%)	⬆️
versioned-tests-22.x	79.06% <97.83%> (+0.06%)	⬆️

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[bizob2828]

LGTM