image/inspect: Add --platform flag

[vvoland]

• follow up to: image/inspect: Add platform selection moby/moby#49586

- Human readable description for the release notes

Add `--platform` flag to `docker image inspect` to inspect a specific platform of a multi-platform image.

- A picture of a cute animal (not mandatory but encouraged)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 72.72727% with 6 lines in your changes missing coverage. Please review.

Project coverage is 59.33%. Comparing base (2d74733) to head (99a757c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5934      +/-   ##
==========================================
- Coverage   59.33%   59.33%   -0.01%     
==========================================
  Files         358      358              
  Lines       29783    29804      +21     
==========================================
+ Hits        17672    17684      +12     
- Misses      11142    11150       +8     
- Partials      969      970       +1     

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