cmd/cp: Add oci-layout-path flag

[mauriciovasquezbernal]

What this PR does / why we need it:

The oci-layout can't be used when the image reference contains a slash ( see issue 1505). This PR introduces a new oci-layout-path that explicitly receives the path of the oci layout fixing the parsing ambiguity.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #1505

Please check the following list:

• [X] Does the affected code have corresponding tests, e.g. unit test, E2E test?
• [X] Does this change require a documentation update?
• [ ] Does this introduce breaking changes that would require an announcement or bumping the major version?
• [ ] Do all new files have an appropriate license header?

[mauriciovasquezbernal]

I updated the PR with the --from-oci-layout-path idea discussed on #1505. I'll update the documentation once we agree on this approach.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 83.86%. Comparing base (b6ac8e9) to head (642fcae). Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1507      +/-   ##
==========================================
+ Coverage   83.84%   83.86%   +0.02%     
==========================================
  Files         118      118              
  Lines        5156     5164       +8     
==========================================
+ Hits         4323     4331       +8     
  Misses        592      592              
  Partials      241      241              

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[TerryHowe]

It seems like it would be easy to add a e2e test for this.

[mauriciovasquezbernal]

It seems like it would be easy to add a e2e test for this.

I added some tests. There is some duplication with the existing layout tests but I didn't find an easy way to avoid it.