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/domain/token.go

@@ -20,6 +20,8 @@ type Token struct {
 	Expiration        time.Time
 	Scopes            []string
 	PreferredLanguage string
+	Reason            TokenReason
+	Actor             *TokenActor
 }
 
 func AddAudScopeToAudience(ctx context.Context, audience, scopes []string) []string {
@@ -44,3 +46,22 @@ func addProjectID(audience []string, projectID string) []string {
 	}
 	return append(audience, projectID)
 }
+
+//go:generate enumer -type TokenReason -transform snake -trimprefix TokenReason -json
+type TokenReason int
+
+const (
+	TokenReasonUnspecified TokenReason = iota
+	TokenReasonAuthRequest
+	TokenReasonRefresh
+	TokenReasonJWTProfile
+	TokenReasonClientCredentials
+	TokenReasonExchange
+	TokenReasonImpersonation
+)
+
+type TokenActor struct {
+	Actor  *TokenActor `json:"actor,omitempty"`
+	UserID string      `json:"user_id,omitempty"`
+	Issuer string      `json:"issuer,omitempty"`
+}