http2: add diagnostics channel 'http2.client.stream.start'

[RaisinTen]

No description provided.

[nodejs-github-bot]

Review requested:

• @nodejs/http2
• @nodejs/net

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/66771/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.19%. Comparing base (6184730) to head (79695a2).
Report is 22 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #58292   +/-   ##
=======================================
  Coverage   90.18%   90.19%           
=======================================
  Files         631      631           
  Lines      186690   186703   +13     
  Branches    36666    36663    -3     
=======================================
+ Hits       168360   168388   +28     
+ Misses      11126    11125    -1     
+ Partials     7204     7190   -14     

Files with missing lines	Coverage Δ
lib/internal/http2/core.js	95.46% <100.00%> (+0.01%)	⬆️

... and 30 files with indirect coverage changes

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[nodejs-github-bot]

Landed in b197355