Add CI, linter and license checkers

[Superskyyy]

1. Add initial CI to cover lint, license check, DLC
2. Enforce coding style
3. Update dependency and provide commands to fix code smell

[wu-sheng]

You need an empty GHA file in default branch first, otherwise, you can't verify in PR. Or you have to merge first and open another to test.

[Superskyyy]

I will merge this one first, as some lint of the spot_detector.py will fail for the OSPP student to fix. Thanks