[Feature] Make a Postgres Database Source for the Graphql Provider

[YourTechBud]

The problem faced currently?

The next gen SC needs db support

How can we solve it?

Following features will be required:

1. Support for database inspection (Use AtlasGo). Inspected schema will be used to generate graphql types
2. Support for generation of SQL queries for CRUD operations (Reuse existing codebase as much as possible)
3. Request level or source level dataloader for read queries (we can think about writes later)

If you want this feature to be implemented, give it a thumbs up reaction, so that we can determine which features are important to you.
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