style: enable ConstantName in checkstyle

[marysiuniq]

Related to #5119.

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 44.87179% with 43 lines in your changes missing coverage. Please review.

Project coverage is 37.34%. Comparing base (ede3e46) to head (e16dff7).
Report is 347 commits behind head on master.

Files with missing lines	Patch %	Lines
...va/com/thealgorithms/backtracking/KnightsTour.java	0.00%	10 Missing ⚠️
.../main/java/com/thealgorithms/others/RabinKarp.java	0.00%	8 Missing ⚠️
.../dynamicprogramming/MatrixChainMultiplication.java	0.00%	7 Missing ⚠️
.../thealgorithms/matrixexponentiation/Fibonacci.java	0.00%	6 Missing ⚠️
...va/com/thealgorithms/datastructures/trees/LCA.java	0.00%	5 Missing ⚠️
...om/thealgorithms/dynamicprogramming/Fibonacci.java	0.00%	4 Missing ⚠️
...in/java/com/thealgorithms/maths/FindKthNumber.java	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5139      +/-   ##
============================================
- Coverage     37.36%   37.34%   -0.02%     
+ Complexity     2350     2349       -1     
============================================
  Files           517      517              
  Lines         15618    15618              
  Branches       2971     2971              
============================================
- Hits           5836     5833       -3     
- Misses         9495     9496       +1     
- Partials        287      289       +2     

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