http2: add diagnostics channel 'http2.server.stream.created'

[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/66935/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.24%. Comparing base (38757c9) to head (d5a2e25).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #58390   +/-   ##
=======================================
  Coverage   90.24%   90.24%           
=======================================
  Files         633      633           
  Lines      186902   186916   +14     
  Branches    36696    36699    +3     
=======================================
+ Hits       168672   168691   +19     
- Misses      11026    11034    +8     
+ Partials     7204     7191   -13     

Files with missing lines	Coverage Δ
lib/internal/http2/core.js	95.51% <100.00%> (+0.01%)	⬆️

... and 28 files with indirect coverage changes

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