[Host.ApachePulsar] Support for Apache Pulsar

[riussi]

As you support Kafka already it would be great to get support for Apache Pulsar as well.

https://pulsar.apache.org/

Cheers.

[zarusz]

Hello @riussi,

Pulsar looks really promising. That could be added to SMB at some point. I would need to see some demand from the community to devote my immediate time for that. Do you have a need to use Pulsar with SMB anytime soon?

I could also welcome a PR with initial contribution here (transport implementation, documentation, sample).

There is a .NET client libraries that could be used:
https://pulsar.apache.org/docs/en/client-libraries-dotnet/

[zarusz]

See #57