[DISCUSS] PIP-284 Refactor SystemTopicBasedTopicPoliciesService by TableView

[mattisonchao]

Hi, Folks

I would like to follow the PIP process to start the discussion of PIP-284[1].

Please don't hesitate to leave your concern and suggestions.

Best,
Mattison

[1] https://github.com/apache/pulsar/pull/20828