Enable Microsoft Entra Authentication for Azure SQL Database

[doherty100]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [ X ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

N/A

Any log messages given by the failure

N/A

Expected/desired behavior

Implement Microsoft Entra Authentication for terraform-azurerm-mssql.

OS and Version?

N/A

Versions

#AzureSandbox v2.13.7

Mention any other details that might be useful

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