diagnostics_channel: add WindowChannel and scopes

[Qard]

This adds WindowChannel, adds a using syntax equivalent to runStores, and modifies the internals to use these to avoid closures in several places.

Depends on #61674

cc @nodejs/diagnostics

[nodejs-github-bot]

Review requested:

• @nodejs/web-infra

[github-actions]

Failed to start CI

   ⚠  No approving reviews found
   ✘  Refusing to run CI on potentially unsafe PR

https://github.com/nodejs/node/actions/runs/21678728231

[RafaelGSS]

Could you please expand on PR description on why this is needed? We have channels, tracingChannels and now windowChannel, it would be great to know for which kind of situations we need each one of them.

[RafaelGSS]

Suggested change

	> Stability: 1 - Experimental
	> Stability: 1 - Experimental

Perhaps 1.1 Active Development instead?

[Qard]

WindowChannel is mainly just to enable using syntax scopes, but is exposed as there are possible use cases where one may want to emit events around a block/scope without the greater complexity of TracingChannel.

It's also replacing most of the internals of TracingChannel to make it more coherent since there seemed to be a lot of misunderstanding of how it worked. Now TracingChannel is just a WindowChannel around start + end, a WindowChannel around asyncStart + asyncEnd, and an error channel.

[codecov]

Codecov Report

❌ Patch coverage is 87.82051% with 38 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.73%. Comparing base (5e818c9) to head (1018c57).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/diagnostics_channel.js	86.08%	38 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61680      +/-   ##
==========================================
- Coverage   89.74%   89.73%   -0.01%     
==========================================
  Files         674      675       +1     
  Lines      204389   204607     +218     
  Branches    39280    39291      +11     
==========================================
+ Hits       183424   183607     +183     
- Misses      13264    13293      +29     
- Partials     7701     7707       +6     

Files with missing lines	Coverage Δ
...nternal/async_local_storage/async_context_frame.js	100.00% <100.00%> (ø)
lib/internal/async_local_storage/async_hooks.js	98.03% <100.00%> (+0.08%)	⬆️
lib/internal/async_local_storage/run_scope.js	100.00% <100.00%> (ø)
lib/diagnostics_channel.js	88.51% <86.08%> (-10.59%)	⬇️

... and 39 files with indirect coverage changes

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