Support longer paths for Windows 10/11

[xtracool]

pathvalidate.sanitize_filename() is clipping to 255 on Windows 11.

My Windows 11 installation has long filename enabled by default in the registry.
It would be good to either check that setting, or at least be able to override the 255 limit when calling the method.

[thombashi]

@xtracool
You can increase the limit by the max_len argument of the function.