Expose AWS Secrets Manager case sensitive option

[femiadebayo]

#628

The "pydantic-settings[aws-secrets-manager]" integration does not expose the case_sensitive parameter in it's API. It defaults to True and cannot be changed.

/pydantic_settings/sources/providers/aws.py

class AWSSecretsManagerSettingsSource(EnvSettingsSource):
def init(
self,
settings_cls: type[BaseSettings],
secret_id: str,
env_prefix: str | None = None,
env_parse_none_str: str | None = None,
env_parse_enums: bool | None = None,
) -> None:

    ... 

    super().__init__(
        settings_cls,
        case_sensitive=True,
        env_prefix=env_prefix,
        env_nested_delimiter='--',
        env_ignore_empty=False,
        env_parse_none_str=env_parse_none_str,
        env_parse_enums=env_parse_enums,
    )

[hramezani]

This change is unrelated. please revert this and the other ones

[hramezani]

Thanks @femiadebayo for this PR. Please revert unrelated formatting changes