GH-77609: Add follow_symlinks argument to `pathlib.Path.glob()` (GH-102616)

Add a keyword-only *follow_symlinks* parameter to `pathlib.Path.glob()` and`rglob()`.

When *follow_symlinks* is `None` (the default), these methods follow symlinks except when evaluating "`**`" wildcards. When set to true or false, symlinks are always or never followed, respectively.