Add centralized configuration management module

[krrish175-byte]

Addressing issue #6974

Implements a shared configuration management module using YAML.

• Adds ConfigLoader and ExampleUsage classes
• Demonstrates global + per-service configuration overrides
• Includes sample config.yaml and Maven setup

Benefits

• Avoids duplicated .env/application.properties
• Simplifies environment management
• Improves maintainability and security

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.33%. Comparing base (d717ca4) to head (96d4e1e).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6988   +/-   ##
=========================================
  Coverage     78.33%   78.33%           
  Complexity     6638     6638           
=========================================
  Files           748      748           
  Lines         22100    22100           
  Branches       4340     4340           
=========================================
+ Hits          17311    17312    +1     
+ Misses         4091     4090    -1     
  Partials        698      698           

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