Initial release of version 2.

Support for pydantic v2. Better naming and clearer code.

1. __env_yaml_settings_files__ -> __yaml_files__.
2. __env_yaml_settings_reload__ -> __yaml_reload__.
3. model_config can include yaml_files and yaml_reload.
4. deep_update replaces old code.
5. env variable and other sources tested.
6. Conforms with the example provided in the docs.
7. Examples are tested, docs improved.

Initial Release

Tested. This will be moved to v1.0.0 to be consistent with pydantic versioning eventually.