Add support for attach utility

[jonesbusy]

Description

Fix #164

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 93.02326% with 3 lines in your changes missing coverage. Please review.

Project coverage is 81.99%. Comparing base (c9259ed) to head (8c8adba).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main/java/land/oras/Registry.java	93.02%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #169      +/-   ##
============================================
+ Coverage     81.91%   81.99%   +0.08%     
- Complexity      290      292       +2     
============================================
  Files            25       25              
  Lines          1056     1072      +16     
  Branches        107      108       +1     
============================================
+ Hits            865      879      +14     
  Misses          137      137              
- Partials         54       56       +2     

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