Add Pool Size and Max Overflow Config for CTL Engines

[pattisdr]

Is your feature request related to a specific problem?

Related comment: #2511

We recently added the ability to configure the pool_size and max_overflow on Sqlalchemy engines created ops-side, but the ctl side also has engines that are not yet configurable.

The consequences of having low limits here is that users can hit QueuePool errors when there are a small number of simultaneous connections on the database.

Describe the solution you'd like

Ideally, we'd consolidate some of the ctl and ops engines (ctl side also has asynchronous engines) while we're at it too. A quick change would be just making the ctl engines configurable.

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.