Email Opt-out and Suppression list functionality

I opened a [ticket for the Azure Communication Services documentation](https://github.com/MicrosoftDocs/azure-docs/issues/115284). The quick summary is the documentation mention "opt-out" and "suppression list" in several places ([1](https://learn.microsoft.com/en-us/azure/communication-services/concepts/email/email-overview#:~:text=Opt%2DOut%20handling%20support%20to%20automatically%20detect%20and%20respect%20opt%2Douts%20managed%20in%20our%20suppression%20list.) [2](https://learn.microsoft.com/en-us/azure/communication-services/concepts/analytics/insights/email-insights#:~:text=opt%2Dout%20of%20receiving%20emails%20from%20you)). We integrated ACS on the assumption these capabilities would be present.

However, ACS still lacks any APIs or portals to view or manage suppressed emails, nor does ACS provide a way for customers to opt-out. I checked the roadmap and do not see any items relating to email.

I've made a [feature request](https://feedback.azure.com/d365community/idea/18bfd607-9fb4-ee11-92bc-000d3a033659). However, given the legal requirements for providing unsubscribe links and the fact that it's mentioned in the docs, I'd consider this a bug.

cross-posted to azure/communication-preview#162