Litestar-users

- fix an instance check if not using `advanced_alchemy` model bases.

[v.1.2.1]

- add support for models with BigInt primary keys.
- change user management route path param names.

- add experimental user relationship loader interface.

- add `py.typed`.
- add authentication identifier customization.

- add DTO validations on startup.
- add optional request context to various `BaserUserService` `pre-*` and `post-*` hooks.
- remove deprecated `LitestarUsersConfig.sqlalchemy_plugin_config`.

- add CLI.
- rename `LitestarUsers` class to `LitestarUsersPlugin`.

- add `LitestarUsersConfig.auth_backend_class` attribute.
- remove `LitestarUsersConfig.auth_backend` attribute.
- update role assignment/revocation route handlers to use HTTP PUT.