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/feature/feature.go

@@ -9,6 +9,7 @@ const (
 	KeyTriggerIntrospectionProjections
 	KeyLegacyIntrospection
 	KeyUserSchema
+	KeyTokenExchange
 )
 
 //go:generate enumer -type Level -transform snake -trimprefix Level
@@ -29,4 +30,5 @@ type Features struct {
 	TriggerIntrospectionProjections bool `json:"trigger_introspection_projections,omitempty"`
 	LegacyIntrospection             bool `json:"legacy_introspection,omitempty"`
 	UserSchema                      bool `json:"user_schema,omitempty"`
+	TokenExchange                   bool `json:"token_exchange,omitempty"`
 }