Move all internal/ packages to a root internal/

[jonjohnsonjr]

This will simplify my life a bit.

[codecov-commenter]

Codecov Report

Merging #983 (94f805a) into main (549ee62) will decrease coverage by 0.03%.
The diff coverage is n/a.

❗ Current head 94f805a differs from pull request most recent head 66ff264. Consider uploading reports for the commit 66ff264 to get more accurate results

@@            Coverage Diff             @@
##             main     #983      +/-   ##
==========================================
- Coverage   74.61%   74.58%   -0.04%     
==========================================
  Files         107      107              
  Lines        5027     5020       -7     
==========================================
- Hits         3751     3744       -7     
  Misses        721      721              
  Partials      555      555              

Impacted Files	Coverage Δ
internal/and/and_closer.go	100.00% <ø> (ø)
internal/compare/image.go	75.00% <ø> (ø)
internal/compare/index.go	75.00% <ø> (ø)
internal/compare/layer.go	75.00% <ø> (ø)
internal/estargz/estargz.go	100.00% <ø> (ø)
internal/gzip/zip.go	88.57% <ø> (ø)
internal/legacy/copy.go	56.25% <ø> (ø)
internal/retry/retry.go	100.00% <ø> (ø)
internal/verify/verify.go	100.00% <ø> (ø)
pkg/crane/copy.go	51.21% <ø> (ø)
... and 16 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 549ee62...66ff264. Read the comment docs.