Feat adds content and header properties to CodegenResponse (#11046)

* Adds responseHeaders to codegenResponse

* Sets response headers in codegenResponse

* Samples updated

* Adds test of response headers

* Adds content to CodegenResponse

* Sets codegenResponse content

* Tests added, test content-data.yaml spec update

* Adds mediaTypeSchemaSuffix input to getContent

* Tests updated

* Updates how response content schema names are set

* Adds missing Locale to String.format invocations

samples/server/petstore/java-play-framework-no-exception-handling/app/controllers/UserApiController.java

@@ -1,6 +1,7 @@
 package controllers;
 
 import java.util.List;
+import java.time.OffsetDateTime;
 import apimodels.User;
 
 import com.typesafe.config.Config;

samples/server/petstore/java-play-framework-no-exception-handling/app/controllers/UserApiControllerImp.java

@@ -1,6 +1,7 @@
 package controllers;
 
 import java.util.List;
+import java.time.OffsetDateTime;
 import apimodels.User;
 
 import play.mvc.Http;

samples/server/petstore/java-play-framework-no-exception-handling/app/controllers/UserApiControllerImpInterface.java

@@ -1,6 +1,7 @@
 package controllers;
 
 import java.util.List;
+import java.time.OffsetDateTime;
 import apimodels.User;
 
 import com.google.inject.Inject;