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c46772ee - Add a layer of indirection to the local path-based wheel cache (#2909)

Add a layer of indirection to the local path-based wheel cache (#2909) ## Summary Right now, the path-based wheel cache just looks at the symlink to the archives directory, checks the timestamp on it, and continues with that symlink as long as the timestamp is up-to-date. The HTTP-based wheel meanwhile, uses an intermediary `.http` file, which includes the HTTP caching information. The `.http` file's payload is just a path pointing to an entry in the archives directory. This PR modifies the path-based codepaths to use a similar cache file, which stores a timestamp along with a path to the archives directory. The main advantage here is that we can add other data to this cache file (namely, hashes in the future). ## Test Plan Beyond existing tests, I also verified that this doesn't require a version bump: ``` git checkout main cargo run pip install ~/Downloads/zeal-0.0.1-py3-none-any.whl --cache-dir baz --reinstall git checkout charlie/manifest cargo run pip install ~/Downloads/zeal-0.0.1-py3-none-any.whl --cache-dir baz --reinstall cargo run pip install ~/Downloads/zeal-0.0.1-py3-none-any.whl --cache-dir baz --reinstall --refresh ```