[evaluator/while]: Add support for break

[MarkusFreitag]

while loops currently do not support break statements, the following PoC runs endlessly.

count = 0
i = 0
while (i >= 0)
  count = count + 1
  puts(i)
  if (true)
    break
  end
  i = i - 1
end
puts(count)

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[codecov]

Codecov Report

Merging #168 (99a4fd7) into main (4ce7753) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
+ Coverage   87.24%   87.25%   +0.01%     
==========================================
  Files         106      106              
  Lines        3621     3624       +3     
==========================================
+ Hits         3159     3162       +3     
  Misses        396      396              
  Partials       66       66              

Impacted Files	Coverage Δ
evaluator/while.go	100.00% <100.00%> (ø)

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[MarkusFreitag]

TODO: update the documentation