Add copy rete limiter

[imsunv]

solve #89

[codecov-commenter]

Codecov Report

Merging #90 (432adff) into main (d69252f) will decrease coverage by 5.68%.
The diff coverage is 6.25%.

❗ Current head 432adff differs from pull request most recent head 155df18. Consider uploading reports for the commit 155df18 to get more accurate results

@@            Coverage Diff             @@
##             main      #90      +/-   ##
==========================================
- Coverage   77.19%   71.50%   -5.69%     
==========================================
  Files           9       10       +1     
  Lines         171      186      +15     
==========================================
+ Hits          132      133       +1     
- Misses         19       32      +13     
- Partials       20       21       +1     

Impacted Files	Coverage Δ
options.go	85.71% <ø> (ø)
ratelimited_reader.go	0.00% <0.00%> (ø)
copy.go	75.23% <25.00%> (-1.24%)	⬇️

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[otiai10]

Thank you @imsunv.

I don't want to include specific algorithm inside this.
Thus, I created #91 to allow users to define their custom Reader.

Please take a look #91