Create a new SSO group mapping

Example request

{
  "id": "f6cfb91a-52ea-4a86-bf9a-5a891a26f52b",
  "group_id": "2b096711-4d28-4417-8635-64af4f62c1ae",
  "group_name": "Viewers Group",
  "sso_attribute": "basic-attribute",
  "sso_value": "basic-attribute-value",
  "description": "Maps basic-attribute to Viewers Group",
  "created_by_email": "jsmith@example.com",
  "created_at": 1576300370,
  "updated_at": 1576300370
}