Validate digest when pushing blobs

[jonesbusy]

Description

Validate digest when pushing blobs

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 85.71429% with 4 lines in your changes missing coverage. Please review.

Project coverage is 84.78%. Comparing base (9c56295) to head (15cfbae).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main/java/land/oras/Registry.java	69.23%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #206   +/-   ##
=========================================
  Coverage     84.78%   84.78%           
- Complexity      408      411    +3     
=========================================
  Files            33       33           
  Lines          1380     1387    +7     
  Branches        148      150    +2     
=========================================
+ Hits           1170     1176    +6     
- Misses          141      142    +1     
  Partials         69       69           

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