Enable Client Credential OAuth Flow for Microsoft 365 Email Module in Fusion

[#1]

We are currently using the "Microsoft 365 Email" module in Fusion and have observed that it only supports the delegated OAuth flow for add a connection. It is not possible to use the client credential OAuth flow instead, particularly for connecting to a shared mailbox so we don't have a connection that is based on individual credentials.

This functionality would be highly beneficial for our integration needs and avoid breaking connection when individual is moving to another team or leave Dell