Respect to non-string filter types while output OpenAPI parameters

[wonderbeyond]

Effect with drf-spectacular:

[codecov-io]

Codecov Report

Merging #1306 (176c0fe) into master (6045fff) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1306      +/-   ##
==========================================
- Coverage   99.44%   99.44%   -0.01%     
==========================================
  Files          15       15              
  Lines        1265     1250      -15     
==========================================
- Hits         1258     1243      -15     
  Misses          7        7              

Impacted Files	Coverage Δ
django_filters/rest_framework/backends.py	100.00% <100.00%> (ø)
django_filters/filters.py	100.00% <0.00%> (ø)
django_filters/filterset.py	100.00% <0.00%> (ø)
django_filters/rest_framework/filterset.py	100.00% <0.00%> (ø)

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[auvipy]

can you please adjust the tests as well to make the CI green?

[carltongibson]

As per #1432 the in-built schema support is going to be deprecated in the next version.

Rather, I recommend you migrate to use drf-spectacular, which is much more fully featured, and under active development.

https://drf-spectacular.readthedocs.io/en/latest/readme.html

If for some reason you're not able to use drf-spectacular you can copy the django_filters.rest_framework.backends.DjangoFilterBackend into your own project to customise as needed. (But use drf-spectacular.)

Thanks.