Drf Access Policy Versions Save

• Adds Statement dataclass as alternative to dictionaries. Drops Python 3.5 support.

• Fixes read-only scenario for FieldAccessMixin. Thanks @hungryseven!

• Adds PermittedSlugRelatedField to re-use scope_queryset methods on policies. Thanks @bradydean!

• Adds PermittedPkRelatedField to re-use scope_queryset methods on policies.

• Fixes issue with boolean parser and shared request state. Thanks @mari8i!

• Adds support for field-level permissions via a AccessPolicy.scope_fields(request, fields: dict, instance=None) method and the FieldAccessMixin. Thanks @gianpieropa!

• Adds a mixin for explicitly defining a single access policy per ViewSet.

• Fixes race condition between concurrent requests in evaluation of condition expressions. Thanks @goranpavlovic!

:warning: Breaking Change :warning:

• The condition element no longer supports the evaluation of multiple methods joined with boolean logic. These statements must be updated to use the new condition_expression element, which does support complex boolean logic. See migration notes.

• Allow defining reusable_conditions in settings as a list. Thanks @HonakerM!