feat: Add setting/getting properties on directories #12247
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Summary:
We'd like to set/get properties on directories if the remote filesystem supports APIs like TTL. In POSIX, this would be similar to ioctl.
Simply expose a property bag for which users can use for setting key-value pairs for the set path, and on the get path, only support getting a single key for now. If the key is not present, nullopt is returned.
Differential Revision: D68650034