* 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>
