Lapidary-render

Removed

- Removed support for generating exceptions

Fixed

- Don't include body models of error responses in return types of operation methods
- Update `Metadata` annotation name from `Headers`

Added

- Wrap request headers (and cookies) in a model class

Changed

- Replace return envelope with a tuple
- Generate new serialization style parameter

Fixed

- Removed `Awaitable` from return type hints
- Fixed support for read/writeOnly fields - add default value `None`
- Added missing runtime dependency on httpx