feat: support push a blob to a remote registry

[lizMSFT]

Add a command to push a blob to a remote registry

Resolves: https://github.com/oras-project/oras/issues/476 Signed-off-by: Zoey Li [email protected]

[qweeah]

Please mark the command blob and blob push preview. You may refer to other comamnds like attach or copy.

[codecov-commenter]

Codecov Report

Merging #489 (c8b5c29) into main (9a014d6) will increase coverage by 1.35%. The diff coverage is 83.01%.

@@            Coverage Diff             @@
##             main     #489      +/-   ##
==========================================
+ Coverage   70.72%   72.08%   +1.35%     
==========================================
  Files          11       12       +1     
  Lines         427      480      +53     
==========================================
+ Hits          302      346      +44     
- Misses        101      107       +6     
- Partials       24       27       +3     

Impacted Files	Coverage Δ
internal/file/file.go	83.01% <83.01%> (ø)

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