Add interface point for RNGs

[ablaom]

Replaces #164

[codecov-commenter]

Codecov Report

Merging #166 (d2b51af) into dev (6c48032) will increase coverage by 1.62%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #166      +/-   ##
==========================================
+ Coverage   88.94%   90.56%   +1.62%     
==========================================
  Files           8        8              
  Lines         208      212       +4     
==========================================
+ Hits          185      192       +7     
+ Misses         23       20       -3     

Impacted Files	Coverage Δ
src/types.jl	100.00% <ø> (ø)
src/builders.jl	100.00% <100.00%> (+37.50%)	⬆️
src/classifier.jl	100.00% <100.00%> (ø)
src/common.jl	96.55% <100.00%> (+0.18%)	⬆️
src/image.jl	100.00% <100.00%> (ø)
src/regressor.jl	100.00% <100.00%> (ø)

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[ablaom]

@ayush-1506 Could you please review?

[ayush-1506]

Sure, will review this later today.