Dynamic serialization schema

It would be useful to reimplement the `ResponseMixin.response` function to accept a static function as the _schema_ argument so that we can build the schema based on the client request, which is needed for _JSON:API_ requests and using _marshmallow-jsonapi_ as a serializer.

Below is an example of a use case:

```python3

@bp.route('/')
class Resource(MethodView)

def get_fields(request):
fields = parser.parse(JsonApiRequestSchema, request, location='query')
schema = ResourceSchema(many=true, only=fields)
return schema

@bp.response(200, get_fields)
def get(self):
pass
```

Start by reading the ResponseMixin.response function and compare its current schema handling with the example using get_fields. Trace how the client request reaches response serialization. Done means a static function can build and supply the schema for JSON:API and marshmallow-jsonapi use cases, with behavior covered by the project's existing checks.

Written by the indexing model from the issue text.