Expose glob expansion through the path utilities

[josh-hemphill]

I saw glob expansion is now being used in the shell; it'd be nice to be able to also utilize it when using the path utilities.

I think making the $.path automatically resolve globs would be a massive overhaul, but if we added another function e.g. $.glob that returns either an array or async iterator of Path instances, it could make things more convenient.

[josh-hemphill]

Ah, I didn't realize the expand-glob was part of the @std/fs package. Should I open the issue in the path repo, or would the subpath import still increase its size and be better added here?