django-rest-framework-gis support

[tfranzel]

Forked the schema code from django-rest-framework-gis, fixed some issues and restructured the code to make it work with spectacular.

support for:

• GeoJSON responses (list/retrieve) for GeoFeatureModelSerializer
• geo fields in regular serializers
• geo pagination
• all geo fields supported including sane fallback for under-specified geometry field.

This supersedes previous effort for support in #38 #67 #743 and #744

Feedback welcome!

[codecov]

Codecov Report

Merging #746 (b51575c) into master (efd8e7b) will decrease coverage by 0.06%.
The diff coverage is 96.17%.

@@            Coverage Diff             @@
##           master     #746      +/-   ##
==========================================
- Coverage   98.81%   98.74%   -0.07%     
==========================================
  Files          64       66       +2     
  Lines        7324     7505     +181     
==========================================
+ Hits         7237     7411     +174     
- Misses         87       94       +7     

Impacted Files	Coverage Δ
tests/conftest.py	97.87% <ø> (ø)
drf_spectacular/contrib/rest_framework_gis.py	92.92% <92.92%> (ø)
drf_spectacular/openapi.py	97.30% <100.00%> (+<0.01%)	⬆️
drf_spectacular/plumbing.py	97.29% <100.00%> (+0.01%)	⬆️
tests/contrib/test_rest_framework_gis.py	100.00% <100.00%> (ø)
tests/test_extensions.py	100.00% <100.00%> (ø)

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[joey-kevala]

Thanks @tfranzel, I tested this on my codebase and it works great other than the one minor issue in the polygon example