Add loki support for app logging

[PeterHasse]

Feature Request

Summary

Add the option to push non-metric logging to loki. This will add another level of observability to testbeds and also will allow in field debugging of omnt

Context

distributed logging without cloud / analytics

Proposed Solution

Send all log outputs of OMNT to loki

Alternatives Considered

N/A

Additional Context

N/A

Related Issues

none