Feature/ci

[sei-secheverria]

Addresses CI setup in project. CI will still fail for now since there are no unit tests, but that should be fixed shortly. This PR specifically:

• Adds a Github Actions CI config to add a CI workflow
• Adds make commands to simplify running the different linting checks and formatting commands
• Added type hint checking to all of the above
• Added new optional group for qa dependencies
• Added type hints and some casts where needed
• Fixed type issue where Flag attributes were being abused as both strings and as the later compiled regex patterns, by storing both things separately