Add first-load tracking attributes to `makeGetMixin`
The makeFindMixin already included data for first-load tracking. For example, a videos service has two boolean attributes: haveVideosBeenRequestedOnce and haveVideosLoadedOnce. This adds feature parity for the makeGetMixin and adds the following attributes:
has${capitalizedResource}BeenRequestedOncehas${capitalizedResource}LoadedOnce
These attributes can now be used to track first-load scenarios in the makeGetMixin.