Add ability to specify recursion depth for recursive modifier

[vjik]

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

Fix #154

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c41c37f) 99.58% compared to head (3da856e) 99.59%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #155      +/-   ##
============================================
+ Coverage     99.58%   99.59%   +0.01%     
- Complexity      277      282       +5     
============================================
  Files            22       22              
  Lines           718      736      +18     
============================================
+ Hits            715      733      +18     
  Misses            3        3              

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[what-the-diff]

PR Summary

• Enhancement of Recursion Depth Feature
  The Pull Request has included an improvement that now allows users to specify how deep they want the system to go into a thread or task while repeating a function (this process is known as "recursion"). This ability has been added to the update log (CHANGELOG.md).

• Code Examples for New Feature
  Practical coding examples highlighting how to utilize our newly introduced feature have been added to the instruction manual (README.md).

• Minor Code Optimizations
  Minor code adjustments have been made to enhance the stability of the programme. This includes ignoring irrelevant issues identified by our code checker 'Psalm' in psalm.xml, and adjustments made in DataModifiers.php and Merger.php files.

• Improved Construct
  An updated constructor parameter and getter method for managing "recursion depth" levels have been added to RecursiveMerge.php.

• Ensuring Robustness
  A thorough set of tests has been conducted and encoded in ConfigTest.php for different levels of recursion depths to ensure the new feature works across various conditions.

• Test Cases Included
  Additional files that include the specific test cases used for checking the newly added feature can be found in the /tests/TestAsset/configs/recursion-depth directory.