add action to manage grafana organization/team memberships of user

When a new thing is created, a Team and a Organization with name thing.project.name will also be created (if they don't yet exist). The team will be added to Main Org. (orgId = 1).

Why Teams?

• Teams give the group members View access to the automatically created dashboards that appear in the project folders.
• Permission are granted on the project folders and not on the individual dashboards.
• The user can see all dashboards/folders that he as access to together in the Grafana Main Org.

Why also Organizations?

• Users want to create, edit and share dashboards, i.e. have Role Editor
• Datasource permissions for Users/Teams can only be set in Grafana Enterprise.
• To ensure only authorized people get access to (read-only) datasource, we have to keep the datasources in separate organizations.

How does the User log in?

• via Sign in with TSM-Frontend or Helmholtz-AAI, Oauth2 , ... on the Grafana login page
  • Organization/Team memberships are set by dispatcher action.
    • IS FIXED: If user logs in to Grafana for the first time it will currently not work, as setting the memberships require the user to already exist in Grafana.
    • Can be fixed by a retry on the dispatcher action if user does not yet exist.

What does the User see?

• In Main Org:
  • View all automatically created dashboards in their respective project folders.
• In each project Org.:
  • View and edit all automatically created dashboards in the project folder
  • Create new Folders and dashboards based on (read-only) project datasources

Optionally, a Project/Organization Admin could manually be set by the Grafana-Admin.

Related to tsm-orchestration!92 (merged)