Merge `Akka.Streams.Azure.EventHub.V5` into `Akka.Streams.Azure.EventHub`

[Arkatufus]

This will be done in the future.

• Replace Akka.Streams.Azure.EventHub with Akka.Streams.Azure.EventHub.V5
• Deprecate Akka.Streams.Azure.EventHub.V5 NuGet package.
• No earlier than October 2022