stream: support ArrayBufferView in Utf8Stream write() buffer mode

[agape1225]

Utf8Stream#write() in 'buffer' content mode only accepted Buffer instances, even though the underlying implementation only needs byte-addressable data. This accepts any ArrayBufferView (TypedArray, DataView) and reinterprets it as a Buffer over the same bytes (without copying), so callers no longer need to wrap other typed arrays in Buffer.from() themselves.

Views are normalized to a Buffer at the single entry point (#writeBuffer), using byteOffset/byteLength rather than the view's element-count length, so that internal length bookkeeping used by mergeBuf()/Buffer.concat() and the write-release logic keeps operating on real byte counts. This mirrors the existing pattern in zlibBuffer() (lib/zlib.js).

[nodejs-github-bot]

Review requested:

• @nodejs/streams

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.32%. Comparing base (673cdef) to head (c15c1bc).
⚠️ Report is 66 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #65301      +/-   ##
==========================================
- Coverage   90.32%   90.32%   -0.01%     
==========================================
  Files         760      751       -9     
  Lines      248553   250244    +1691     
  Branches    46910    47298     +388     
==========================================
+ Hits       224510   226026    +1516     
- Misses      15462    15577     +115     
- Partials     8581     8641      +60     

Files with missing lines	Coverage Δ
lib/internal/streams/fast-utf8-stream.js	81.33% <100.00%> (+0.50%)	⬆️

... and 104 files with indirect coverage changes

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