Add ability to set custom config merge plan file path, config and vendor directories

[vjik]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues

[what-the-diff]

PR Summary

• Enhanced Customizability in ConsoleApplicationRunner Class
  The ability to set a custom configuration merge plan file path and config and vendor directories has been added. This provides users more flexibility adjusting to their specific needs.

• Requirements Update in Dependencies
  The required version of the 'yiisoft/yii-runner' dependency has been updated to "^2.2". Bringing the system in line with the latest stable version of the dependency for improved performance and stability.

• Additional Test Suite
  A 'Unit.suite.yml' file was added, potentially increasing detailed testing capabilities and ensuring code quality.

• New Test Class
  The 'ConsoleApplicationRunnerTest' class along with related files were added in the 'Unit' directory. This is to confirm the controller's actions are producing the expected results.

• Custom Configuration Files
  New custom configuration files were tucked in under the 'Unit/Support/custom-config' and 'Unit/Support/custom-merge-plan/config' directories, likely to mimic various user environments for thorough testing.

• New 'UnitTester' Class
  A new 'UnitTester' class was added in the 'tests_support' directory, it stands to reason that this enhancement is to streamline and improve unit testing.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.60%. Comparing base (587fe6c) to head (99445b5).

Additional details and impacted files

@@              Coverage Diff              @@
##             master      #50       +/-   ##
=============================================
+ Coverage          0   60.60%   +60.60%     
- Complexity        0        3        +3     
=============================================
  Files             0        1        +1     
  Lines             0       33       +33     
=============================================
+ Hits              0       20       +20     
- Misses            0       13       +13     

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