[NEOS-1639] Add pre/post sync SQL hooks

[nickzelei]

We want to add the ability for users to configure a webhooks at the job level.

Initial MVP includes:

• SQL-based hook to run prior to the first table sync
• SQL-based hook to run after the last table sync

Input:

• SQL to run
• Connection ID to run on the connection itself
• Weight (to handle ordering of multiple hooks)
• Name and/or description of the hook for auditing/logging purposes

_{From SyncLinear.com | NEOS-1639}