Support for no compression for directories

[jonesbusy]

Description

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 84.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 82.82%. Comparing base (c07550b) to head (9c8e4fb).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...ain/java/land/oras/utils/SupportedCompression.java	82.60%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #170      +/-   ##
============================================
+ Coverage     81.99%   82.82%   +0.82%     
- Complexity      292      299       +7     
============================================
  Files            25       26       +1     
  Lines          1072     1077       +5     
  Branches        108      104       -4     
============================================
+ Hits            879      892      +13     
+ Misses          137      130       -7     
+ Partials         56       55       -1     

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