added ArrowFunction to check for correct use of arrow functions

[AlexHaxe]

No description provided.

[codecov]

Codecov Report

Merging #484 into dev will decrease coverage by 0.01%.
The diff coverage is 96.11%.

@@            Coverage Diff             @@
##              dev     #484      +/-   ##
==========================================
- Coverage   96.79%   96.78%   -0.02%     
==========================================
  Files         103      104       +1     
  Lines        6557     6658     +101     
  Branches      897      907      +10     
==========================================
+ Hits         6347     6444      +97     
- Misses        209      213       +4     
  Partials        1        1

Impacted Files	Coverage Δ
...rc/checkstyle/checks/coding/CodeSimilarityCheck.hx	95.51% <78.57%> (-1.71%)	⬇️
src/checkstyle/checks/coding/ArrowFunctionCheck.hx	98.87% <98.87%> (ø)

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