Add Matrix.filterCols and Matrix.filterRows

[kMutagene]

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This PR adds the functions Matrix.filterCols and Matrix.filterRows

Closes #169

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• [x] The project builds without problems on your machine

[Optional]

• [x] Added unit tests regarding the added features

[codecov-commenter]

Codecov Report

Merging #170 (426ea05) into developer (a23fcd7) will increase coverage by 0.25%. The diff coverage is 100.00%.

@@              Coverage Diff              @@
##           developer     #170      +/-   ##
=============================================
+ Coverage      17.37%   17.63%   +0.25%     
=============================================
  Files            114      114              
  Lines           9284     9312      +28     
  Branches        1150     1152       +2     
=============================================
+ Hits            1613     1642      +29     
  Misses          7393     7393              
+ Partials         278      277       -1     

Impacted Files	Coverage Δ
src/FSharp.Stats/Matrix.fs	17.73% <100.00%> (+3.27%)	:arrow_up:
tests/FSharp.Stats.Tests/Matrix.fs	99.18% <100.00%> (+0.03%)	:arrow_up:

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