Draft: feat(oidc): Switch API from Drupal OAuth to use Keycloak in its place

• feat(oidc): Switch API from Drupal OAuth to use Keycloak in its place

As part of the migration away from drupal auth, openvsx is one of the 3 remaining services that use the oauth server in the API stack. With only 1 main consumer, this should be a relatively simple switch over.

requested review from @malowe and @gnugomez

Set as draft, as this feature is blocked by the downstream server still being on Drupal OAuth. This was done in advance so once they are ready, we can more easily test the updated integrations.

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• 90649cc6 - feat(oidc): Switch API from Drupal OAuth to use Keycloak in its place

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