Get next service by distance/time

[rikroe]

Proposed change

Adds additional attributes to condition based services (next service by distance and time) as well as as string representation of current check control messages.

Both are for use within specific HA sensors.

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to this library)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:

Checklist

• The code change is tested and works locally.
• Tests have been added to verify that the new code works.