Litestar-users

- add `argon2-cffi` dependency.
- default password hashing scheme to `argon2`.

- add defaults to `StarliteUsersConfig` options.
- add option to subclass the user repository.
- fix documentation links.
- rework how routes are excluded from authentication.

- unify `BaseUserService` and `BaseUserRoleService` et al.
- add configuration options to `StarliteUsersConfig`.
- add `hash_schemes` configuration to `PasswordManager`
- remove configuration class variables from `BaseUserService`.
- remove `UserRoleAssociationMixin`.
- remove `SQLAlchemyUserRoleMixin`.
- remove `__tablename__` declarations from SQLAlchemy mixins.

- fix session login response serialization issue.

- fix verification issue.

- replace broken SQLAlchemy forward refs.