* Use @cached_property in PlexSession.user
* Use @cached_property in PlexServer.library
* Use @cached_property in PlexServer.settings
* Tests: Update clearing plex.settings cache
* Use @cached_property in LibrarySection.totalSize
* Add backports.cached-property==1.0.2; python_version<="3.7" dependency
* Import cached_property from dist or backports
* Add backports.cached-property to requirements_dev.txt
* Remove version pin for backports.cached-property in requirements.txt
Co-authored-by: JonnyWong16 <9099342+JonnyWong16@users.noreply.github.com>
Co-authored-by: JonnyWong16 <9099342+JonnyWong16@users.noreply.github.com>