chore: export core package and transition GetCommands to its own package

[remyleone]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 72.40%. Comparing base (5bf53e0) to head (5b2f3e4). Report is 272 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/scw-doc-gen/main.go	0.00%	2 Missing :warning:
cmd/scw-qa/main.go	0.00%	2 Missing :warning:
cmd/scw/main.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4093 +/- ## ========================================== - Coverage 75.45% 72.40% -3.06% ========================================== Files 202 289 +87 Lines 44323 53766 +9443 ========================================== + Hits 33444 38929 +5485 - Misses 9653 13240 +3587 - Partials 1226 1597 +371 ```

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