Introduce WorkflowUser

Problem/Motivation

Introducing WorkflowUser as a decorator for User facilitates some coding.

• public function isOwner(EntityInterface $entity): bool;
• public function addOwnerRole(EntityInterface $entity): static;
• public function isSuperUser(WorkflowTypeAttributeInterface $entity): bool;
• public function addSuperUserRole(WorkflowTypeAttributeInterface $entity): static;

It replaces static functions in WorkflowRole Object:

• public static function addOwnerRole(UserInterface $user, ?EntityInterface $entity = NULL): void;
• public static function isOwner(AccountInterface $account, ?EntityInterface $entity = NULL): bool;

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes