Support Policy Store in Apache Polaris

[HonahX]

Is your feature request related to a problem? Please describe.

Policy Management in Polaris was first proposed in #999. To move forward with implementation, we need to introduce new APIs for policy management and make the necessary updates to Polaris-Core to support them.

I've drafted an implementation proposal here: Google Doc.

A quick summary of what's included:

• Specs for Policy Management APIs
• Persisting policies as a new entity type in Polaris
• A new table (PolicyMappingRecord) in the persistence layer to track
  policy attachments to tables, catalogs, namespaces, and views
• New privileges required for the new APIs

I suggest keeping the discussion on the general concept of Policy in #999 and using this thread for implementation details.

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