feat: Integration test for verifying grant revocation

[konac-hamza]

No description provided.

[goOdyaga]

@gtema
I thought that reason of the fails about the new implementations. So I didn't try to change anything in the PR. Do I need to change anything in the request:?

[gtema]

I was looking at it yesterday and found few issues:

• appcreds (as used in the test) need to keep original roles for the token revolution check, while dropping unavailable roles in the response. I addressed this yesterday in a different PR by introducing new method for calling roles on token. This requires PR rebase
• token revolution works with a seconds precision (instead of microseconds) and that requires a 1second wait after revoking role before trying to auth again
• sqlite (most likely sqlx driver) has some weird bug that token issued_at is compared wrongly. For MySQL/postgres works correct. I want to try to chase it down today

[gtema]

it should be fine now to resolve the conflicts and update the test: there is a similar test verifying the revoke provider with the difference that it explicitly creates revocation event instead of revoking the concrete role and it does not verify the "auth" aspect like this test does