Add symlink API support for Windows, expose symlink methods.

[bruvzg]

Note: create_link require evelated privilegies or Developer Mode enabled.

[Calinou]

Does this address godotengine/godot-proposals#1329?

Adding create_link is possible, but in most cases it required admin privileges, so it won't be useful for most apps.

I thought this wasn't required anymore since Windows 10 when using actual symlinks (as opposed to junctions).

[bruvzg]

I thought this wasn't required anymore since Windows 10 when using actual symlinks (as opposed to junctions).

No, seems like on Windows 10 and 11 it works without elevation only if Developer mode is enabled. But will add it anyway.

[akien-mga]

Thanks!