OAuth implicit token response types, including the query-mode crash

## What

OAuth implicit `token` / `id_token+token` response types. #4870 requests support; #21112 is the crash when using that response_type with response_mode=query.

## Want

- OAuth implicit `token` / `id_token+token` response types
- #4870 requests support
- #21112 is the crash when using that response_type with response_mode=query

## Ideas this came from

- [#4870 providers/oauth2: support `token` response type](https://github.com/goauthentik/authentik/issues/4870) — Currently, authentik supports these response types for an OAuth provider: It would be useful if it also supported the token response type as applications such a
- [#21112 OAuth: response_mode=query with response_type=id_token+token results in Python exception](https://github.com/goauthentik/authentik/issues/21112) — When using responsetype=idtoken token (no code) together with responsemode=query (instead of default), it results in a Python exception and doesn't work. How to

Start by tracing the OAuth response_type handling and the response_mode=query path, then read linked issues #4870 and #21112 for the requested behavior and crash details. Done means token and id_token+token implicit responses are supported and the query-mode Python exception no longer occurs.

Written by the indexing model from the issue text.