Add connector for Pravega

https://www.pravega.io/

Similar to Kafka connector, it will be great to add a connector for Pravega.

Some info on [pravega vs Kafka](https://siliconangle.com/2017/04/17/dell-emc-takes-on-streaming-storage-with-open-source-solution-pravega-ffsf17/#:~:text=Kaitchuck%20outlined%20how%20Pravega%20differs,Pravega%20is%20a%20streaming%20system.&text=Pravega%20offers%20a%20system%20with,one%20or%20two%20big%20writes)

Start by locating and reading the existing Kafka connector, then review Pravega's documentation and the linked project information to identify the integration requirements. Done means Pinot has a working Pravega connector with appropriate coverage comparable to the Kafka connector.

Written by the indexing model from the issue text.