Implement API fencing

[antonagestam]

Todo

• Write docs
• Document USE_TZ requirement
• Guard against using USE_TZ = False
• Coverage
• OpenAPI schema

Using the allow_if_unmodified_since from this patch requires USE_TZ = True. In my opinion that's best practice anyway and reasonable requirement, let me know if you think we should support USE_TZ = False. We should document the requirement and look into ways of making friendly and early error messages.

[github-actions]

File	Coverage	Lines	Branches		Missing
All files	92%	97%	87%	✅
__init__.py	83%	100%	67%	❌
models.py	97%	100%	93%	✅
url.py	97%	100%	94%	✅
admin/extension.py	93%	100%	86%	✅
admin/api/i18n.py	90%	80%	100%	✅	9
admin/api/mixins.py	69%	75%	63%	❌	70, 78-84, 94, 110, 117-128
admin/api/serializers.py	75%	100%	50%	❌
admin/api/versioning.py	92%	100%	83%	✅
admin/api/views.py	99%	99%	100%	✅	134
admin/api/schemas/base.py	88%	75%	100%	✅	3
admin/api/schemas/yasg.py	89%	96%	82%	✅	77, 86, 125-126
drf/fencing.py	87%	95%	80%	✅	80-86, 109
management/commands/syncpermissions.py	88%	95%	80%	✅	31

Minimum allowed coverage is 85%

Generated by 🐒 cobertura-action against fc8e0bf

[hannseman]

Fantastic! 🥇

Left a couple of small comments but looks really solid.

[antonagestam]

The OpenAPI schema is currently looked botched when running this on SAPI (not sure why). I'll do some digging before merging.

[antonagestam]

I had missed inheriting from BananasSwaggerSchema which botched the naming, and missed decorating partial_update, both are fixed now.

[hannseman]

Nice work! 🚀