CMR Granule extension

[jaybarra]

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Extend the STAC Item properties with a new extension specific to CMR values.

[codecov-commenter]

Codecov Report

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

Project coverage is 88.49%. Comparing base (a8db4bf) to head (f41d19f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #360      +/-   ##
==========================================
+ Coverage   88.36%   88.49%   +0.12%     
==========================================
  Files          24       24              
  Lines        1169     1173       +4     
  Branches      257      259       +2     
==========================================
+ Hits         1033     1038       +5     
+ Misses        136      135       -1     

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