Create GraphQL, entities, and queries for Tenants

[joewalling]

Create the necessary graphql, entities, and queries for tenancies. A tenant should have the following properties:

• Id
• Name
• Edition
• IsActive
• CreationDate

If the tenant list has already been created, then change the list to load the data from this new service.

This will require a data migration.

Provide the logic to save a new or edited tenant.