Add support for tar files in OCI Layout in adition of exploded directories

[jonesbusy]

Description

Add support for tar files in OCI Layout in adition of exploded directories

Fixes #668

Testing done

Automated tests

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 94.73684% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.80%. Comparing base (8e20441) to head (fab06f4).

Files with missing lines	Patch %	Lines
src/main/java/land/oras/OCILayout.java	93.75%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #739      +/-   ##
============================================
+ Coverage     86.59%   87.80%   +1.21%     
- Complexity      968      985      +17     
============================================
  Files            45       45              
  Lines          3036     3068      +32     
  Branches        381      384       +3     
============================================
+ Hits           2629     2694      +65     
+ Misses          248      216      -32     
+ Partials        159      158       -1     

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