Invenio-oauth2server

- setup: move to flask-oauthlib-invenio
- global: replace werkzeug.url with urllib.parse
- tests: changed status_code
- fix: LegacyAPIWarning
- fix: DeprecationWarning:
- tests: apply changes for sqlalchemy>=2.0
- setup: bump major dependencies

- setup: change to reusable workflows
- setup: pin dependencies

- global: remove six usage
- compatibility: to werkzeug >= 2.3.0
- setup: unpin wtforms dependency
- fix: DeprecationWarning HTMLString
- settings: update page to reflect additional required parameter
- i18n: push translations

- settings-ui: fix token scopes list

- fix: before_first_request deprecation
(add finalise app entrypoint)

- settings: simplify token query