style: include ICAST_IDIV_CAST_TO_DOUBLE

[vil02]

Continuation of #5122.

Based on AverageTest.testAverageInt Average::average(int[]) should return some integer type.

• 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 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.78%. Comparing base (5ab6356) to head (6982b28).

Files with missing lines	Patch %	Lines
...n/java/com/thealgorithms/others/KochSnowflake.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6121      +/-   ##
============================================
- Coverage     73.79%   73.78%   -0.02%     
  Complexity     5118     5118              
============================================
  Files           658      658              
  Lines         17632    17632              
  Branches       3391     3391              
============================================
- Hits          13011    13009       -2     
- Misses         4117     4118       +1     
- Partials        504      505       +1     

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