Provide a `resource_type` route parameter (e.g. for openapi, jsonapi_schema)

OpenAPI for JSON:API is getting a complete rewrite so I think this may no longer be necessary.

Something to consider: while debugging ✨ Support JSON:API filters Needs work and trying to filter a resource, I was getting lots of errors until I realized that the first element of the array is used as the resource type, as noted in #5. Since _jsonapi_resource_types is an array, I had (wrongly) assumed that order didn't matter and put all the types in alphabetical order.

It would be great to find a way to make this more clear to devs.

Any update here?

If there are updates they will be posted here.