* Set type of default `django.core.cache` to `BaseCache`
- The previous type `ConnectionProxy` is just a proxy class, thus
revealing `Any` for _all_ cache methods
* fixup! Set type of default `django.core.cache` to `BaseCache`
* Refactor to more easily support additional config options
* Notify when Manager.from_queryset happens inside model class body
- A warning will be emitted whenever `Manager.from_queryset` happens
inside of a model class body
* Resolve generated default manager types before final iteration
A default manager on a model should always exist, eventually. Although,
we extend to look through dynamically generated managers on each
iteration instead of deferring until the final iteration.
Instead of copying methods over from a QuerySet passed to a basemanager
when invoking '<BaseManager>.from_queryset', any QuerySet methods are
declared as attributes on the manager.
This allows us to properly lookup any QuerySet method types via a
'get_attribute_hook' and will thus remove disorienting phantom errors
occuring from mypy trying to resolve types only existing in the module
where the _original_ (and real) queryset method was declared.
Petter Friberg