enhance django-filter.readthedocs.io for JSONField

[tmc9031]

according to newest django-rest-framework SearchFilter support JSONField
whether django-filter could support JSONField ???
also add django-filter.readthedocs.io document context ???

https://www.django-rest-framework.org/community/3.12-announcement/
Nested searches against JSONField and HStoreField

https://www.django-rest-framework.org/api-guide/filtering/
For JSONField and HStoreField fields you can filter based on nested values within the data structure using the same double-underscore notation:

search_fields = ['data__breed', 'data__owner__other_pets__0__name']

[amirhoseinbidar]

it seems django-filter can support JSONField ( with some problems that i am not sure they related to django-filter or jsonfield )

you can read my issue and solution here:

#1313

[carltongibson]

See also #1110.