feat: array step function

[kusakusakusa]

Checklist

• [x] New Extension
• [x] New Test
• [ ] Changed more than one extension, but all changes are related
• [ ] Trivial change (doesn't require changelog)

Inspired from ruby's step

[EZSwiftExtensionsBot]

	1 Message
:book:	Executed 174 tests, with 0 failures (0 unexpected) in 4.320 (4.486) seconds

Generated by :no_entry_sign: Danger

[codecov-io]

Codecov Report

Merging #427 into master will increase coverage by 0.1%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #427     +/-   ##
=========================================
+ Coverage   40.44%   40.55%   +0.1%     
=========================================
  Files          49       49             
  Lines        2193     2197      +4     
=========================================
+ Hits          887      891      +4     
  Misses       1306     1306

Impacted Files	Coverage Δ
Sources/ArrayExtensions.swift	82.94% <100%> (+0.54%)	:arrow_up:

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[kusakusakusa]

Hmm im not sure how to implement this for multi dimensional array. Will close this PR