Java client, adds RequestBody (#390)

* Updates java classes

* Adds needed supporting java files

* Adds request body classes

* Updates content blah schema class names

* Fixes request body class names

* Adds sealed request body type

* Adds component schema refed schemas to request body imports in java

* Fixes component request body filenames

* Request bodie outer class updated with sealed request body classes

* Adjusts class names in request body classes

* Has container classes extend other classes if they are simple json schema classes

* Adds int32 and int64 container class extensions

* Fixes Int64 extension

* Adds extension of string container classes

* Adds needed imports for request bodies

* Adds requestBody serialize method that the concrete classes will call

* Adds sealed classes to switch, increases java requiremnt to 21

* Fixes indentation in request body class, switches java version back to 17

* Adds required data method to schema sealed classes

* Uses index for request body variable names

* For refed request bodies, adds nested classes thjat inherit from the refed classes

* Updates petstore docs

* Adds RequestBodySerializerTest

* Request body serialization throws exception for unimplemented content types

* Adds text plain request body serialization and a test of it

* Adds draft request body docs

* Updates readmes

* Improves ref request body docs

* Improves SerializedRequestBody serialize description

* Adds sealed request body class into to request body docs

* Adds request body mediatype info to request body docs

* Removes sealed class info from refed schema docs

* Fixes links from content schema docs to component schema docs

* Adds schema doc container schema extension info when schemas are refed

* In request body docs adds links from media type to schema docs

* Adds links to boxed schemas in request body docs

* Sample regen

* Adds request bodies to java generator docs

* Fixes python request body init files in petstore

* Samples regen

Author: spacether

docs/generators/java.md

@@ -184,6 +184,12 @@ src/main/java/org/openapijsonschematools/client/exceptions/InvalidAdditionalProp
 src/main/java/org/openapijsonschematools/client/exceptions/InvalidTypeException.java
 src/main/java/org/openapijsonschematools/client/exceptions/UnsetPropertyException.java
 src/main/java/org/openapijsonschematools/client/exceptions/ValidationException.java
+src/main/java/org/openapijsonschematools/client/mediatype/Encoding.java
+src/main/java/org/openapijsonschematools/client/mediatype/MediaType.java
+src/main/java/org/openapijsonschematools/client/parameter/ParameterStyle.java
+src/main/java/org/openapijsonschematools/client/requestbody/GenericRequestBody.java
+src/main/java/org/openapijsonschematools/client/requestbody/RequestBodySerializer.java
+src/main/java/org/openapijsonschematools/client/requestbody/SerializedRequestBody.java
 src/main/java/org/openapijsonschematools/client/schemas/AnyTypeJsonSchema.java
 src/main/java/org/openapijsonschematools/client/schemas/BooleanJsonSchema.java
 src/main/java/org/openapijsonschematools/client/schemas/DateJsonSchema.java
@@ -285,6 +291,7 @@ src/main/java/org/openapijsonschematools/client/servers/ServerProvider.java
 src/main/java/org/openapijsonschematools/client/servers/ServerWithVariables.java
 src/main/java/org/openapijsonschematools/client/servers/ServerWithoutVariables.java
 src/test/java/org/openapijsonschematools/client/configurations/JsonSchemaKeywordFlagsTest.java
+src/test/java/org/openapijsonschematools/client/requestbody/RequestBodySerializerTest.java
 src/test/java/org/openapijsonschematools/client/schemas/AnyTypeSchemaTest.java
 src/test/java/org/openapijsonschematools/client/schemas/ArrayTypeSchemaTest.java
 src/test/java/org/openapijsonschematools/client/schemas/BooleanSchemaTest.java