Enhancing Multitenant Deployment: Adding Hub Deployment Option and Feature Flag for Optional Resources

[kunalbabre]

• [Multitenant-all] (Importance: High) I would expect to give users/customers the option to deploy a new Hub and all the required resources or not. I think I have not seen that as a simple feature flag or instruction in the readme docs.
• [Multitenant-all] (Importance: Medium) some resources are not workload-agnostic. For instance, SQL Database could potentially be substituted by other DBs (i.e. cosmos DB, MongoDB etc.). I believe we should have some kind of "Feature flag" for those resources and let the users/customer decide whether they need them.

[kunalbabre]

Bicep implementation is completed for Hub option, TF option pending

[dmossberg]

Terraform is completed