Update CLI interaction

[macisamuele]

The goal of this change is to ensure that:

• in case multiple rules (or blacklist rules) are passed via the CLI they will be honored, before this change only the last rule would be honored
• improve ergonomics: rules should be defined after the main command (explain, run, etc) such that no weird errors are raised (ie. invalid choice: 'run' (choose from 'MIS-E001', 'MIS-E002', ...))
• provide info command: useful while integrating it on CI systems as well as during issues creation

[codecov[bot]]

Codecov Report

Merging #11 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #11   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          59     60    +1     
  Lines        1808   1851   +43     
  Branches      115    118    +3     
=====================================
+ Hits         1808   1851   +43

Impacted Files	Coverage Δ
swagger_spec_compatibility/cli/run.py	100% <100%> (ø)	:arrow_up:
swagger_spec_compatibility/cli/common.py	100% <100%> (ø)	:arrow_up:
swagger_spec_compatibility/cli/__init__.py	100% <100%> (ø)	:arrow_up:
swagger_spec_compatibility/cli/version.py	100% <100%> (ø)
tests/conftest.py	100% <100%> (ø)	:arrow_up:
swagger_spec_compatibility/cli/explain.py	100% <100%> (ø)	:arrow_up:
swagger_spec_compatibility/__main__.py	100% <100%> (ø)	:arrow_up:
tests/__main___test.py	100% <100%> (ø)	:arrow_up:

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