refactor: rename `token_type` to `token_use` in introspection
refactor: rename `token_type` to `token_use` in introspection

Closes #1762

BREAKING CHANGE: This changes the OAuth2 Token Introspection response to ensure compliance with the OAuth2 Token Introspection specification. Previously, `token_type` would return `access_token` or `refresh_token`. The specification however mandates that `token_type` is always `Bearer`. This patch resolves that issue. The previous behaviour of `token_type` has now been moved to `token_use` which can be `access_token` or `refresh_token`.

ory/hydra,ory/hydra,ory/hydra,ory/hydra,ory-am/go-iam,ory-am/hydra,ory-am/go-iam