Pdns-logger

- new testunits
- new github worflows for testing and build stages
- normalize timestamp to utc and isoformat
- new verbose mode
- update README.md

- fix issue 2 - does not produce valid JSON: Uses single quotes instead of double quotes as string delimiter
- fix issue 3 - should print log messages to STDOUT as documented instead of STDERR
- new docker file

- fix issue 1 external dnslib replaced by dnspython
- remove unneeded build dependency

- first release