Add new postgres query sources to demo command

[rwfeather]

Change description

This includes more configured properties when running the demo CLI

We didn't have an query-based sources, so this adds a few.

Since these new config objects are going to be specific to the source and the source database, I've included them under a postgres/{source} directory.

Checklists

Development

• Application changes have been tested appropriately

Impact

• Code follows company security practices and guidelines
• Security impact of change has been considered
• Performance impact of change has been considered
• Possible migration needs considered (model migrations, config migrations, etc.)

Please explain any security, performance, migration, or other impacts if relevant:

Code review

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