Add CopyOption and add option for deep copy (index of index)

[jonesbusy]

Description

Add CopyOption and add option for deep copy (index of index)

Testing done

Automated tests

Miss one test on Registry that create and Index with nested Index

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

❌ Patch coverage is 62.50000% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.45%. Comparing base (bd1e7c3) to head (5306e21).

Files with missing lines	Patch %	Lines
src/main/java/land/oras/OCI.java	41.66%	10 Missing and 4 partials ⚠️
src/main/java/land/oras/CopyUtils.java	93.33%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (62.50%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #610      +/-   ##
============================================
+ Coverage     87.25%   87.45%   +0.19%     
  Complexity      843      843              
============================================
  Files            42       42              
  Lines          2542     2566      +24     
  Branches        314      317       +3     
============================================
+ Hits           2218     2244      +26     
+ Misses          202      195       -7     
- Partials        122      127       +5     

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