[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/openapi3/client/petstore/python/test/test_foo_get_default_response.py

@@ -0,0 +1,37 @@
+"""
+    OpenAPI Petstore
+
+    This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\  # noqa: E501
+
+    The version of the OpenAPI document: 1.0.0
+    Generated by: https://openapi-generator.tech
+"""
+
+
+import sys
+import unittest
+
+import petstore_api
+from petstore_api.model.foo import Foo
+globals()['Foo'] = Foo
+from petstore_api.model.foo_get_default_response import FooGetDefaultResponse
+
+
+class TestFooGetDefaultResponse(unittest.TestCase):
+    """FooGetDefaultResponse unit test stubs"""
+
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def testFooGetDefaultResponse(self):
+        """Test FooGetDefaultResponse"""
+        # FIXME: construct object with mandatory attributes with example values
+        # model = FooGetDefaultResponse()  # noqa: E501
+        pass
+
+
+if __name__ == '__main__':
+    unittest.main()