add chown() method

[mjgardner]

Please add a chown method to parallel the existing chmod method.

[xdg]

What advantage does that have over the built-in chown? E.g. why not:

# assuming $file = path("/some/path/to/whatever");
chown 100, 100, $file;

Generally, Path::Tiny methods don't just wrap built-ins. There are exceptions (move, remove) but I view those as legacy mistakes.

[mjgardner]

Mainly so it can throw the same exceptions on failure as the other Path::Tiny methods, rather than having to make built-in chown throw its own exception.

[martinvonwittich]

The ability to use user/group names instead of uids/gids like in File::chown would be nice.