[Logging] Enrich debug output with used ENVs

[Moep90]

As I want to debug kapitan as ARGOCD Plugin, I (after 2.4) need to see the ENVS and their content in debug mode.

Therfore I'd like to dump every ENV + VALUE kapitan has loaded to stdout.

@ramaro any suggestion where it should be added?
My initial thought was to extend the logger.debug for all ref engines.

Current workaround:

$ python -c "import json, os;print(json.dumps(dict(os.environ)))"

[ramaro]

Potentially somewhere after this line should be good https://github.com/kapicorp/kapitan/blob/master/kapitan/cli.py#L568

[github-actions]

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[dav9]

@Moep90 I'm proposing this PR now: #1099, it will add support for setting all kinds of logger errors. Would it help?

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