Fully type module then mark as `py.typed`

This is an issue to track `jaraco.path` being marked as `py.typed`.
I'd rather not lie about the typed state of a library and wait until all its public members are fully annotated (or at least to a "best effort") before being marked as `py.typed`.

Refs:
- https://github.com/jaraco/skeleton/issues/98
- https://github.com/jaraco/skeleton/pull/136#discussion_r1714057809
- https://github.com/pypa/setuptools/issues/2345

The issue names no source files, tests, or entry points. Start by inventorying jaraco.path's public members and reviewing the linked typing discussions; done means the public API is annotated to a best-effort standard and the package can be marked py.typed without overstating its typed coverage.

Written by the indexing model from the issue text.