Support multi-topic subscriptions with Apache Pulsar

[laszlzso]

There are multiple ways how this could be implemented, namely:

1. Instead of/Beyond the existing configuration option "stream.pulsar.topic.name": "pulsar-test" we could have something like "stream.pulsar.topic.names": [ "pulsar-test-1", "pulsar-test-2"].
2. Beyond the above existing configuration option we could have something like "stream.pulsar.topic.pattern": "pulsar-test-*" where the pattern adheres to standard regex rules.
3. We could support such pattern-like inputs in the existing configuration option, e.g. an input field like "stream.pulsar.topic.name": "persistent://some_tenant/some_namespace/*" should make Pinot bind a real-time table to all topics under the given tenant/namespace.

Another alternative solution would be the capability of binding multiple topics to the same real-time table by sending subsequent requests to the Pinot Server (e.g., first, creating some_table as a real-time one and providing topic A as its source, however, a subsequent real-time table request with the name some_table and topic B would just subscribe to B and direct the corresponding flow into some_table, as well).

[Jackie-Jiang]

cc @KKcorps

[estebanz01]

hola! 👋

any progress on this? I'm in a position where I'm creating multiple pulsar topics with the same schema and we need to have it in one table instead of one per topic.

[hpvd]

added this to [parent issue] Apache Pulsar related open topics #13010