[REQ] [Java] [WebClient] webclient to support application/x-ndjson

[feech]

Is your feature request related to a problem?

webflux webclient supports applications/x-ndjson which replaces application/stream+json https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/http/MediaType.html#APPLICATION_STREAM_JSON

If openapi specification declares ndjson in the list of possible mediaTypes generated ApiClient ignores it so there is no any chance to select the type from client side, ApiClient selects another type with lower priority

Describe the solution you'd like

proper solution should not ignore ndjson if it present

Describe alternatives you've considered

the other case is to extend generated ApiClient with proper implementation for isJsonMime() as I described in https://github.com/OpenAPITools/openapi-generator/issues/9258#issuecomment-1275384676

Additional context

it might work only for Java Spring WebFlux Webclient as it supports the MimeType out of box it definetly will not work for Spring RestTemlate as it does not support streaming