* refactor(accesscontrol): make addAccess directly accept PolicyRules
* refactor(accesscontrol): add new types for encapsulating all needed data
* refactor(accesscontrol): make getRules return resource version
* refactor(accesscontrol): add new getRoleRefs to policyRuleIndex
* refactor(accesscontrol): make accessStore use the new types and method
* cleanup(accesscontrol): remove unused code
* cleanup(accesscontrol): adapt tests
* cleanup(accesscontrol): add some comments and remove unused function
* refactor(accesscontrol): rework indexer to make it more readable and testable
* Fix typo
* test: consistent use of t.Error
* test: refactor policyRulesMock to just use a map
* misc: rename toUserInfo function
* refactor: consistent sort by UID
