[#7311] feat(policy): add new backend table schema for policy (part-1)

[mchades]

What changes were proposed in this pull request?

add new backend table schema for policy

Why are the changes needed?

Fix: #7311

Does this PR introduce any user-facing change?

no

How was this patch tested?

CI pass

[Abyss-lord]

@mchades @jerryshao Should we also update the comment field types in the upgrade script? For example:

ALTER TABLE metalake_meta ALTER COLUMN metalake_comment SET DATA TYPE TEXT;
ALTER TABLE catalog_meta ALTER COLUMN catalog_comment SET DATA TYPE TEXT;
ALTER TABLE schema_meta ALTER COLUMN schema_comment SET DATA TYPE TEXT;
ALTER TABLE fileset_version_info ALTER COLUMN fileset_comment SET DATA TYPE TEXT;
ALTER TABLE topic_meta ALTER COLUMN comment SET DATA TYPE TEXT;
ALTER TABLE tag_meta ALTER COLUMN tag_comment SET DATA TYPE TEXT;
ALTER TABLE table_column_version_info ALTER COLUMN column_comment SET DATA TYPE TEXT;

[mchades]

Should we also update the comment field types in the upgrade script? For example:

Yes, if there are any requirements, but not in this PR, I think.