feat: add SYSTEM_OWNER role (#6765)

* define roles and permissions

* support system user memberships

* don't limit system users

* cleanup permissions

* restrict memberships to aggregates

* default to SYSTEM_OWNER

* update unit tests

* test: system user token test (#6778)

* update unit tests

* refactor: make authz testable

* move session constants

* cleanup

* comment

* comment

* decode member type string to enum (#6780)

* decode member type string to enum

* handle all membership types

* decode enums where necessary

* decode member type in steps config

* update system api docs

* add technical advisory

* tweak docs a bit

* comment in comment

* lint

* extract token from Bearer header prefix

* review changes

* fix tests

* fix: add fix for activityhandler

* add isSystemUser

* remove IsSystemUser from activity info

* fix: add fix for activityhandler

---------

Co-authored-by: Stefan Benz <stefan@caos.ch>

internal/api/authz/access_token.go

@@ -0,0 +1,44 @@
+package authz
+
+import (
+	"context"
+
+	"github.com/zitadel/zitadel/internal/telemetry/tracing"
+)
+
+const (
+	BearerPrefix = "Bearer "
+)
+
+type MembershipsResolver interface {
+	SearchMyMemberships(ctx context.Context, orgID string, shouldTriggerBulk bool) ([]*Membership, error)
+}
+
+type authZRepo interface {
+	MembershipsResolver
+	VerifyAccessToken(ctx context.Context, token, verifierClientID, projectID string) (userID, agentID, clientID, prefLang, resourceOwner string, err error)
+	VerifierClientID(ctx context.Context, name string) (clientID, projectID string, err error)
+	ProjectIDAndOriginsByClientID(ctx context.Context, clientID string) (projectID string, origins []string, err error)
+	ExistsOrg(ctx context.Context, id, domain string) (string, error)
+}
+
+var _ AccessTokenVerifier = (*AccessTokenVerifierFromRepo)(nil)
+
+type AccessTokenVerifierFromRepo struct {
+	authZRepo authZRepo
+}
+
+func StartAccessTokenVerifierFromRepo(authZRepo authZRepo) *AccessTokenVerifierFromRepo {
+	return &AccessTokenVerifierFromRepo{authZRepo: authZRepo}
+}
+
+func (a *AccessTokenVerifierFromRepo) VerifyAccessToken(ctx context.Context, token string) (userID, clientID, agentID, prefLang, resourceOwner string, err error) {
+	ctx, span := tracing.NewSpan(ctx)
+	defer func() { span.EndWithError(err) }()
+	userID, agentID, clientID, prefLang, resourceOwner, err = a.authZRepo.VerifyAccessToken(ctx, token, "", GetInstance(ctx).ProjectID())
+	return userID, clientID, agentID, prefLang, resourceOwner, err
+}
+
+type client struct {
+	name string
+}