style: enable EqualsHashCode in checkstyle

[CodaBlurd]

Related to #5119.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 38.24%. Comparing base (319d514) to head (1fa0c94).

Files	Patch %	Lines
...com/thealgorithms/datastructures/trees/KDTree.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5157      +/-   ##
============================================
- Coverage     38.25%   38.24%   -0.01%     
+ Complexity     2362     2361       -1     
============================================
  Files           516      516              
  Lines         15304    15305       +1     
  Branches       2957     2957              
============================================
- Hits           5854     5853       -1     
- Misses         9164     9165       +1     
- Partials        286      287       +1     

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[vil02]

Thanks!

I have two remarks:

• if you want to reference an issue or another PR (from the same repository) do it by writing # followed by its number,
• it seems to me that the method equals could be simplified to the form:

        @Override
        public boolean equals(Object obj) {
            if (obj instanceof Point other) {
                return Arrays.equals(other.coordinates, this.coordinates);
            }
            return false;
        }

Would you like to open another PR doing that?

[CodaBlurd]

Yes I will open another PR with the recommended changes. Thank you!