Start implementation of registries.conf

[jonesbusy]

Description

Testing done

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 12.19512% with 36 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.56%. Comparing base (ee703a6) to head (9b6671b).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main/java/land/oras/auth/RegistriesConf.java	0.00%	28 Missing ⚠️
src/main/java/land/oras/utils/TomlUtils.java	38.46%	8 Missing ⚠️

❌ Your patch check has failed because the patch coverage (12.19%) 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     #434      +/-   ##
============================================
- Coverage     87.24%   86.56%   -0.68%     
- Complexity      653      655       +2     
============================================
  Files            39       41       +2     
  Lines          1991     2032      +41     
  Branches        225      230       +5     
============================================
+ Hits           1737     1759      +22     
- Misses          161      180      +19     
  Partials         93       93              

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