Supports: python3.7+, django 3.2+. Tests included for this range.
Breaking changes: None

This implementation uses django-filter as intended. It sets a default filter backend and uses standard filter_class models where possible.

Exceptions take place in the following views:

HostList. Relies on manipulating the queryset, and said manipulation is also used in the filter-less HostDetail.
*Zone*List. The abstraction model for these views is based around propagating a filterset into the parent class.
Concerns:

This patch creates explicit mapping filters for JSONField and CIDRField. It is unclear how well-tested these are.

  - Required as we intriduced the toml file for ruff.
  - Sets some default keys.
  - Make tox.ini use the lint and coverage environments.
  - Make tox runs that use pythons and django show versions for both.

  - Uses filterset_class correctly.
  - Applies the filter via MregMixin.
  - Test basic filtering in hostgroups.

  - Requires manual lookup declarations.
  - See unioslo#489 (comment)