Save descriptor as-is on OCI layout

[jonesbusy]

Save descriptor as-is on OCI layout

Description

Save descriptor as-is on OCI layout

Testing done

CI

Submitter checklist

• I have read and understood the CONTRIBUTING guide
• I have run mvn license:update-file-header, mvn spotless:apply, pre-commit run -a, mvn clean install before opening the PR

[codecov]

Codecov Report

Attention: Patch coverage is 91.42857% with 3 lines in your changes missing coverage. Please review.

Project coverage is 85.06%. Comparing base (0a4f1f9) to head (02aab26).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main/java/land/oras/Registry.java	78.57%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #193      +/-   ##
============================================
+ Coverage     84.60%   85.06%   +0.45%     
- Complexity      360      367       +7     
============================================
  Files            29       29              
  Lines          1260     1272      +12     
  Branches        131      132       +1     
============================================
+ Hits           1066     1082      +16     
+ Misses          133      131       -2     
+ Partials         61       59       -2     

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