[Inline model resolver] better handling of inline responses and bug fixes (#12353)

* better handling of inline response schemas, bug fixes

* update samples

* add new files

* better code format

* remove unused ruby files

* fix java test

* remove unused js spec files

* remove inline_response_default_test.dart

* fix webclient tests

* fix spring tests

samples/client/petstore/java/okhttp-gson/docs/DefaultApi.md

@@ -9,7 +9,7 @@ All URIs are relative to *http://petstore.swagger.io:80/v2*
 
 <a name="fooGet"></a>
 # **fooGet**
-> InlineResponseDefault fooGet()
+> FooGetDefaultResponse fooGet()
 
 
 
@@ -29,7 +29,7 @@ public class Example {
 
     DefaultApi apiInstance = new DefaultApi(defaultClient);
     try {
-      InlineResponseDefault result = apiInstance.fooGet();
+      FooGetDefaultResponse result = apiInstance.fooGet();
       System.out.println(result);
     } catch (ApiException e) {
       System.err.println("Exception when calling DefaultApi#fooGet");
@@ -47,7 +47,7 @@ This endpoint does not need any parameter.
 
 ### Return type
 
-[**InlineResponseDefault**](InlineResponseDefault.md)
+[**FooGetDefaultResponse**](FooGetDefaultResponse.md)
 
 ### Authorization