feat(oidc): token exchange impersonation (#7516)

* add token exchange feature flag

* allow setting reason and actor to access tokens

* impersonation

* set token types and scopes in response

* upgrade oidc to working draft state

* fix tests

* audience and scope validation

* id toke and jwt as input

* return id tokens

* add grant type  token exchange to app config

* add integration tests

* check and deny actors in api calls

* fix instance setting tests by triggering projection on write and cleanup

* insert sleep statements again

* solve linting issues

* add translations

* pin oidc v3.15.0

* resolve comments, add event translation

* fix refreshtoken test

* use ValidateAuthReqScopes from oidc

* apparently the linter can't make up its mind

* persist actor thru refresh tokens and check in tests

* remove unneeded triggers

internal/query/instance_features.go

@@ -12,6 +12,7 @@ type InstanceFeatures struct {
 	TriggerIntrospectionProjections FeatureSource[bool]
 	LegacyIntrospection             FeatureSource[bool]
 	UserSchema                      FeatureSource[bool]
+	TokenExchange                   FeatureSource[bool]
 }
 
 func (q *Queries) GetInstanceFeatures(ctx context.Context, cascade bool) (_ *InstanceFeatures, err error) {