feat: sql targets: migrate insert_records to sqlalchemy

[visch]

Feature scope

Taps (catalog, state, stream maps, etc.)

Description

Right now there's a lot of "manual" interaction with the database for SQL. Example implementation MeltanoLabs/target-postgres#138 .

Current code
https://github.com/meltano/sdk/blob/3ceb28a97a77a5e22163fc887fe16ff129c2dc28/singer_sdk/sinks/sql.py#LL318C27-L318C52

[stale]

This has been marked as stale because it is unassigned, and has not had recent activity. It will be closed after 21 days if no further activity occurs. If this should never go stale, please add the evergreen label, or request that it be added.