Sql test setup

[mathemancer]

Related to #2737

This adds a framework and some example tests for testing SQL functions directly.

Technical details

This necessitated setting up a dev DB service that has some testing functions installed. This can be used for development or testing, as desired. To run the new tests, follow the instructions in the developer guide. Some python tests have been removed, since they would now be redundant.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
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• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[dmos62]

Looks good!

[silentninja]

The only concern I have with this setup is not having the ability to run individual db test cases, other than that everything else looks good!