Enum for Labjack

For example:

• ain_range in set_ain_range() (hvl_ccb/dev/labjack.py) accepts only 4 different values.
• use Enums for the digital state (low / high).
• Refactor set_digital_output(self, address: str, state) -> set_digital_output(self, address: labjack.TSeriesDIOChannel, state: labjack.DIOState)