stream: update iterable streams to use budget backpressure

[jasnell]

WinterTC55/iter-streams#23 updated the backpressure model in the iterable streams specification to use a byte-budget model. This PR updates the implementation to match.

Signed-off-by: James M Snell jasnell@gmail.com
Assisted-by: Opencode/Opus

[nodejs-github-bot]

Review requested:

• @nodejs/quic
• @nodejs/streams

[codecov]

Codecov Report

❌ Patch coverage is 91.16279% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.24%. Comparing base (b4c7be3) to head (939e46e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/internal/streams/iter/share.js	77.41%	14 Missing ⚠️
lib/internal/streams/iter/broadcast.js	93.47%	3 Missing ⚠️
lib/internal/streams/iter/classic.js	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #64464      +/-   ##
==========================================
+ Coverage   90.23%   90.24%   +0.01%     
==========================================
  Files         741      741              
  Lines      241604   241652      +48     
  Branches    45520    45528       +8     
==========================================
+ Hits       218010   218079      +69     
+ Misses      15120    15101      -19     
+ Partials     8474     8472       -2     

Files with missing lines	Coverage Δ
lib/internal/quic/quic.js	100.00% <100.00%> (ø)
lib/internal/quic/state.js	100.00% <100.00%> (ø)
lib/internal/streams/iter/duplex.js	96.35% <100.00%> (ø)
lib/internal/streams/iter/pull.js	84.12% <100.00%> (+0.25%)	⬆️
lib/internal/streams/iter/push.js	90.98% <100.00%> (+0.13%)	⬆️
lib/internal/streams/iter/utils.js	98.21% <100.00%> (ø)
lib/internal/streams/iter/classic.js	89.25% <66.66%> (-0.02%)	⬇️
lib/internal/streams/iter/broadcast.js	86.22% <93.47%> (+0.26%)	⬆️
lib/internal/streams/iter/share.js	85.33% <77.41%> (+0.60%)	⬆️

... and 29 files with indirect coverage changes

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