Add logfmt output

[schmidt-i]

Is your feature request related to a problem? Please describe.
It is hard to parse the output of popeye with log parser when running it unattended in a kubernetes cluster. The JSON output is hard to parse since all linter infos are in an array and it seems impossible to extract labels.
A nice parseable logfmt output with predefined labels like namespace, linter, testname, type, testid and the message would make it easy to create dashboards with logql parsing.

Describe the solution you'd like
Add logfmt output that shows each linter result as a single logline with predefined labels

Describe alternatives you've considered
Parsing json logs -> Hard to achive
using cli logs -> parsing is hard and context is not given

Additional context
Useful in multiteant k8s environements to give each tenant access to their findings.

[derailed]

@schmidt-i Not sure what you mean? json outputs are not logs??
jq has not problems grocking the json output

popeye -s ns -n default -o json | jq -c '.popeye.sections[]'

{"linter":"namespaces","gvr":"v1/namespaces","tally":{"ok":1,"info":0,"warning":0,"error":0,"score":100},"issues":{}}