Support Array.new(args)

[st0012]

This PR supports multiple ways to initialize an Array:

Array.new(3) #=> [nil, nil, nil]
Array.new(3, true) #=> [true, true, true]
Array.new(3) do |i|
  i * 2
end #=> [0, 2, 4]

Closes #831

[codecov]

Codecov Report

Merging #832 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #832      +/-   ##
=========================================
+ Coverage   80.85%   80.9%   +0.05%     
=========================================
  Files          54      54              
  Lines        7405    7425      +20     
=========================================
+ Hits         5987    6007      +20     
  Misses       1193    1193              
  Partials      225     225

Impacted Files	Coverage Δ
vm/array.go	96.34% <100%> (+0.11%)	⬆️

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[hachi8833]

I checked this and LGTM 👍

[st0012]

@hachi8833 thanks 👍