src: expose Windows-only fs open flags

[PickBas]

src: expose Windows-only fs open flags

libuv honors several Windows-only open flags but Node never exported the constants, so they were unreachable from fs.open(). Expose UV_FS_O_TEMPORARY, UV_FS_O_SHORT_LIVED, UV_FS_O_SEQUENTIAL and UV_FS_O_RANDOM under the UV_FS_O_ prefix, matching the existing UV_FS_O_FILEMAP. They are 0 on non-Windows platforms.

UV_FS_O_TEMPORARY deletes the file when the last handle closes, UV_FS_O_SHORT_LIVED avoids flushing a throwaway file to disk, and UV_FS_O_SEQUENTIAL/UV_FS_O_RANDOM hint the access pattern to optimize caching.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.15%. Comparing base (874e96e) to head (23c32f5).
⚠️ Report is 105 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #64775      +/-   ##
==========================================
- Coverage   90.24%   90.15%   -0.09%     
==========================================
  Files         739      744       +5     
  Lines      241676   242522     +846     
  Branches    45544    45694     +150     
==========================================
+ Hits       218102   218653     +551     
- Misses      15101    15359     +258     
- Partials     8473     8510      +37     

Files with missing lines	Coverage Δ
src/node_constants.cc	99.71% <100.00%> (+<0.01%)	⬆️

... and 126 files with indirect coverage changes

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