Add remote.Descriptor.Schema1()

[jonjohnsonjr]

This will allow just passing a remote.Descriptor to remote.Pusher and
also gives an escape hatch for filesystem access to schema1 images.

[codecov-commenter]

Codecov Report

Merging #1626 (88fab54) into main (6ac92e8) will decrease coverage by 0.03%.
The diff coverage is 80.52%.

❗ Current head 88fab54 differs from pull request most recent head dd39fd7. Consider uploading reports for the commit dd39fd7 to get more accurate results

@@            Coverage Diff             @@
##             main    #1626      +/-   ##
==========================================
- Coverage   72.61%   72.59%   -0.03%     
==========================================
  Files         118      119       +1     
  Lines        9462     9513      +51     
==========================================
+ Hits         6871     6906      +35     
- Misses       1889     1902      +13     
- Partials      702      705       +3     

Impacted Files	Coverage Δ
pkg/v1/types/types.go	60.00% <0.00%> (-15.00%)	⬇️
pkg/v1/remote/schema1.go	71.42% <71.42%> (ø)
pkg/v1/remote/write.go	59.94% <73.17%> (-0.06%)	⬇️
pkg/v1/remote/descriptor.go	72.12% <87.71%> (-0.24%)	⬇️
pkg/v1/remote/catalog.go	58.06% <100.00%> (ø)
pkg/v1/remote/delete.go	57.14% <100.00%> (ø)
pkg/v1/remote/image.go	75.59% <100.00%> (ø)
pkg/v1/remote/index.go	70.37% <100.00%> (ø)
pkg/v1/remote/layer.go	63.41% <100.00%> (ø)
pkg/v1/remote/list.go	74.68% <100.00%> (+0.32%)	⬆️
... and 4 more

... and 1 file with indirect coverage changes

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