Review and fix issues with find

[shcheklein]

          okay, problems that I see:

• [ ] maxdepth is not supported
• [ ] withdirs is not supported (must have for expand path)
• [ ] doesn't check bucket name find('.') and find('etasderwer') return the same result
• [ ] it keeps appending ids to cache every time even for already known
• [ ] cache is not locked (multithreading support) - this is a bit more advanced and less critical to start with

Originally posted by @shcheklein in https://github.com/iterative/PyDrive2/issues/229#issuecomment-1242791704