GET /roles/uuid

• Response should contain editable vs not flag (platform roles, vs seeded roles vs custom roles/user defined roles)
• Permissions can be empty for some Roles

Attached are the views that will use this API 

Acceptance Criteria

• A spec is created.
• API spec should take implementation into consideration
• API should be consistent with other RBAC v2 APIs
• Shared in the team-mgmt-fabric channel and reviewed by architects and leads.