Test infrastructure for api service, and Test Database config in docker compose

[KarlFarrar]

This was done really quickly by me so it is very rough sort of still getting used to using python again plz don't judge :)

All documentation for how to use is in README.

Also I didn't write a requirements.txt, but on top of fastapi, sqlalchemy, etc. You'll need to make sure you have pip installed pytest.
I'll make sure to add a requirements.txt to the api services eventually

[gmgrahamgm]

The code itself looks good, however, before we merge, let's get rid of the pycache stuff;

• Delete all __pycache__/ files, commit the changes
• Add __pycache__/ and *.pyc to .gitignore, commit changes.

Other than that though, this is good to go.

[KarlFarrar]

Merged in. Someone do a final check on this PR and we can merge to main. We can use this set up for now, but if we determine we would rather use postman I can look into updating it.