Added the ability to set multiple roles for one contact and one process

Purpose: send a letter from a subtask to a person who has a specific role in the parent project. Example: a project has a contacts tab. Here we can list everyone involved in this project. Each person who is added by a project participant has a role. The same person may participate in another project, but there his role may be completely different. To expose Select the role of this contact for the project/task, etc. on the tab. In conjunction with the settings on the tab, use the "Send notification by email to artist" action. Solution: There is a "Performers" tab. Here, choose a manager - performer, set his role. To send project notifications, use the action of the business process stage: "Send a notification by email to the contractor". Thus, when moving to the stage, specify which executor, which order, which role to send a letter to according to the template. If there are multiple performers, the action will send a notification to multiple performers, to