Add typing to ORM query return value

[qsantos]

This obviously does not cover every case, but it is a significant improvement in that it enables typing on the results of most queries.

[ilevkivskyi]

Also please note tests are failing (you should probably add an explicit __iter__ override).

[qsantos]

• [x] CLA signed
• [ ] __iter__ was making something fail during typecheck; I'll see if I can fix it
• [ ] I'll run the tests of the CI locally to fix the issues with linting/automated testing
• [x] other issues you raised fixed

Nice CI by the way!

[ilevkivskyi]

Thanks for updates! All looks good now, I am just waiting for the test fix.

[CLAassistant]

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