ARSN-625: add per part checksums to object metadata

[leif-scality]

• Add's per part checksums required for COMPOSITE checksums

[bert-e]

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[bert-e]

Incorrect fix version

The Fix Version/s in issue ARSN-625 contains:

• None

Considering where you are trying to merge, I ignored possible hotfix versions and I expected to find:

• 8.5.16

Please check the Fix Version/s of ARSN-625, or the target
branch of this pull request.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.69%. Comparing base (d624af5) to head (c7d9d08).
⚠️ Report is 5 commits behind head on development/8.5.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           development/8.5    #2689      +/-   ##
===================================================
+ Coverage            74.63%   74.69%   +0.05%     
===================================================
  Files                  227      228       +1     
  Lines                18603    18653      +50     
  Branches              3849     3864      +15     
===================================================
+ Hits                 13884    13932      +48     
- Misses                4714     4716       +2     
  Partials                 5        5              

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