feat: add configuration management plugin

[reubenmiller]

Add a configuration management plugin to manage the monit configuration files using the upcoming tedge configuration management plugin interface.

[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
3	5	0	8	37.50	12m49.875459s

Passed Tests

Name	⏱️ Duration	Suite
monit configuration is valid	75.856 s	Monit
Reconnect on cloud connection loss (by stopping mosquitto)	140.347 s	Monit
Use custom log path	140.450 s	Monit

Failed Tests

Name	Message	⏱️ Duration	Suite
Config Types Should Be Registered	Supported configuration fragment is missing c8y_SupportedConfigurations from managed object	107.227 s	Config
Get Configuration	ValueError: Unable to perform POST request. Status: 422 Response: {"message":"Device '' does not exist in inventory! : Finding device data from database failed","error":"devicecontrol/Unprocessable Entity","info":"https://cumulocity.com/api/core/"}	76.506 s	Config
Fail on Unexpected Configuration Type	ValueError: Unable to perform POST request. Status: 422 Response: {"message":"Device '' does not exist in inventory! : Finding device data from database failed","error":"devicecontrol/Unprocessable Entity","info":"https://cumulocity.com/api/core/"}	76.246 s	Config
Set Invalid Configuration	ValueError: Unable to perform POST request. Status: 422 Response: {"message":"Device '' does not exist in inventory! : Finding device data from database failed","error":"devicecontrol/Unprocessable Entity","info":"https://cumulocity.com/api/core/"}	76.581 s	Config
Change Port via Configuration	ValueError: Unable to perform POST request. Status: 422 Response: {"message":"Device '' does not exist in inventory! : Finding device data from database failed","error":"devicecontrol/Unprocessable Entity","info":"https://cumulocity.com/api/core/"}	76.662 s	Config