Allow Schema to be set for other SQL Connectors

[pattisdr]

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Is your feature request related to a specific problem?

The schema can be defined on a ConnectionConfig for Redshift (added out of necessity) and Postgres (added because someone needed this specifically), but it would be nice to add this to the other existing SQL DB Connectors provided this is supported.

Additionally, the database_connectors guides need to be updated https://ethyca.github.io/fidesops/guides/database_connectors/#postgresql (fidesops link, so update the corresponding fides one)

Describe the solution you'd like

A pattern for setting the schema was added here https://github.com/ethyca/fidesops/pull/1375, so it would be similar for other SQL connectors, provided they work the same way. A little research needed here.

Describe alternatives you've considered, if any

A description of any alternative solutions or features you've considered.

Additional context

Add any other context or screenshots about the feature request here.