Migrate `dolt schema` to SQL

`dolt schema` doesn't use SQL and goes directly to on disk resources. Common SQL operations should be able to get and update all information required.

There is also internal column tag information exposed by two sub-commands. We should probably deprecate rather than migrate those.

Difficulty: Medium (easy codewise, but 3 sub-commands to migrate, and 2 to deprecate)
Value: Medium

Overarching Ticket: https://github.com/dolthub/dolt/issues/3922