ffi: support SharedArrayBuffer in getRawPointer

[ganjanggejang]

Add test coverage and documentation for ffi.getRawPointer() support for SharedArrayBuffer.

getRawPointer() already supported SharedArrayBuffer sources, but this behavior was not covered by tests or documented.

Note:

symbols.pointer_to_usize(sharedArrayBuffer) is not used in this test because it goes through the FFI pointer argument conversion path. The current implementation in src/ffi/types.cc only handles ArrayBuffer for pointer arguments and does not support SharedArrayBuffer.

[nodejs-github-bot]

Review requested:

• @nodejs/ffi

[ShogunPanda]

LGTM!

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.17%. Comparing base (bec3d0b) to head (7ebfdb7).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ffi/data.cc	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #64864      +/-   ##
==========================================
+ Coverage   90.14%   90.17%   +0.02%     
==========================================
  Files         746      746              
  Lines      242763   242764       +1     
  Branches    45761    45762       +1     
==========================================
+ Hits       218848   218919      +71     
+ Misses      15402    15322      -80     
- Partials     8513     8523      +10     

Files with missing lines	Coverage Δ
src/ffi/data.cc	73.99% <75.00%> (+0.50%)	⬆️

... and 33 files with indirect coverage changes

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