* refactor: Clean up _response_types_map formatting
It matches black's behavior of having trailing commas now.
* test: Add test to reproduce #16967
* fix: deserialize responses even if no returnType
Closes#16967
* refactor: Simplify ApiException subclasses
* refactor: Move exception subtype choice to ApiException
* feat: Deserialize error responses and add to exceptions
* test: Add for error responses with model
* Copy the current Python generator into a "pydantic v1" generator
This generator will be deprecated over time and the normal generator will
focus on Pydantic v2.
* add missing doc
