[dart-announce] Breaking change 56308: On Windows refer to special null file as '\\?\nul' rather than 'nul'

['Alexander Aprelev' via Dart Announcements]

Recent version of Windows allows to use to long path names up to 32k characters [1]. Use of this feature has been requested by Dart users and implemented in parts of dart:io, but not consistently. We want to uniformly use long path names functionality in dart:io. One side-effect of this is that Windows long-path compatible naming of a special NUL device has to be '\\?\NUL', rather than just 'NUL'.

So this is the breaking change we are proposing: sample code

`File('NUL').writeAsBytesSync(bytes);` becomes `File(r'\\?\NUL').writeAsBytesSync(bytes);`.

If you have any thoughts or concerns about this please leave your feedback on https://github.com/dart-lang/sdk/issues/56308.

[1] https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation

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