feat: GitHub and JSON formatted printers

[estahn]

The issue with print_lines using logger.info still persists. The issue being that docstr_coverage > results.txt does contain the progress bar. I suggest either add a parameter for an output file or remove the progress bar.

This is how it looks like:

:books: docstr_coverage status: :x: FAILED

Overall coverage: 76% (required 80%)

Additional details and impacted files

Filename	Needed	Found	Missing	Coverage
:x: docstr_coverage/__init__.py	1	0	1	0.0%
:white_check_mark: docstr_coverage/badge.py	7	6	1	85.7%
:x: docstr_coverage/cli.py	9	7	2	77.8%
:white_check_mark: docstr_coverage/config_file.py	3	3	0	100.0%
:white_check_mark: docstr_coverage/coverage.py	5	5	0	100.0%
:white_check_mark: docstr_coverage/ignore_config.py	12	11	1	91.7%
:x: docstr_coverage/printers.py	16	9	7	56.2%
:x: docstr_coverage/result_collection.py	29	20	9	69.0%
:white_check_mark: docstr_coverage/visitor.py	14	12	2	85.7%