Refactoring: extract root package configuration reader to separate class

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌

This is preparing to #146

[what-the-diff]

PR Summary

• Refactoring of Root Package Configuration Reader
  The former root package configuration reader has been enhanced and migrated to an individual class, leading to an optimized and more manageable code structure.
• Addition of src/Composer/RootConfiguration.php
  A new file named RootConfiguration.php is introduced in the src/Composer directory, contributing to the project's functionality.
• Renaming Updated File
  The Options.php file in the src/Composer directory has been renamed to src/Composer/Options.php, making its purpose clearer.
• Removal of Redundant Code
  Unused use statements in files like src/Composer/MergePlanProcess.php and src/Config.php have been removed. This action improves the cleanliness of the codebase, reduces any possible confusion, and enhances maintainability.
• Refactoring Options-related Code in src/Composer/ProcessHelper.php
  To promote efficiency and readability, the options-related code in the src/Composer/ProcessHelper.php file has been refactored.
• Addition of New Import types
  New import types have been included in multiple src and tests files, like src/Composer/ProcessHelper.php, src/Config.php, src/ConfigPaths.php, tests/Integration/IntegrationTestCase.php, and so on. These additions broaden the scope of what the project can achieve by importing new types from other modules or packages. They also improve code modularity and reusability.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (956eb22) to head (17b023b).

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #172   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       277       283    +6     
===========================================
  Files             22        23    +1     
  Lines            725       738   +13     
===========================================
+ Hits             725       738   +13     

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