stream: add diagnostics for readable stream chunk additions

[RaisinTen]

This adds a diagnostics channel for tracking chunk additions to readable streams without having any side-effects on user code.

This is needed for #60483 (comment)

[nodejs-github-bot]

Review requested:

• @nodejs/streams

[ronag]

I don't think this is necessary.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.58%. Comparing base (ba7cdf4) to head (1760239).
⚠️ Report is 46 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #60514      +/-   ##
==========================================
+ Coverage   88.56%   88.58%   +0.01%     
==========================================
  Files         704      704              
  Lines      207774   207868      +94     
  Branches    40027    40052      +25     
==========================================
+ Hits       184020   184138     +118     
+ Misses      15800    15766      -34     
- Partials     7954     7964      +10     

Files with missing lines	Coverage Δ
lib/internal/streams/readable.js	96.22% <100.00%> (+0.02%)	⬆️

... and 52 files with indirect coverage changes

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