Better inline model resolver to handle inline schema in array item (#12104)

* better support of inline schema in array item

* update tests

* update samples

* regenerate samples

* fix allof naming, remove files

* add files

* update samples

* update readme

* fix tests

* update samples

* update samples

* add new files

* update test spec

* add back tests

* remove unused files

* comment out python test

* update js test using own spec

* remove files

* remove unused files

* remove files

* remove unused files

* better handling of allOf with a single type

* comment out go test

* remove test_all_of_with_single_ref_single_ref_type.py

* fix inline resolver, uncomment go test

samples/client/petstore/java/feign/.openapi-generator/FILES

@@ -39,6 +39,7 @@ src/main/java/org/openapitools/client/auth/OAuthFlow.java
 src/main/java/org/openapitools/client/auth/OauthClientCredentialsGrant.java
 src/main/java/org/openapitools/client/auth/OauthPasswordGrant.java
 src/main/java/org/openapitools/client/model/AdditionalPropertiesClass.java
+src/main/java/org/openapitools/client/model/AllOfWithSingleRef.java
 src/main/java/org/openapitools/client/model/Animal.java
 src/main/java/org/openapitools/client/model/ApiResponse.java
 src/main/java/org/openapitools/client/model/ArrayOfArrayOfNumberOnly.java
@@ -82,7 +83,7 @@ src/main/java/org/openapitools/client/model/OuterEnumIntegerDefaultValue.java
 src/main/java/org/openapitools/client/model/OuterObjectWithEnumProperty.java
 src/main/java/org/openapitools/client/model/Pet.java
 src/main/java/org/openapitools/client/model/ReadOnlyFirst.java
+src/main/java/org/openapitools/client/model/SingleRefType.java
 src/main/java/org/openapitools/client/model/SpecialModelName.java
 src/main/java/org/openapitools/client/model/Tag.java
 src/main/java/org/openapitools/client/model/User.java
-src/main/java/org/openapitools/client/model/UserType.java