add function to filter out nan values from array #249

[ghost]

Please reference the issue(s) this PR is related to Closes #249

Please list the changes introduced in this PR

• add a dropNaN function into the Array module

Description

add function to filter out nan values from array

[Required] please make sure you checked that

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

[Optional]

• [x] Added unit tests regarding the added features

[codecov-commenter]

Codecov Report

Merging #250 (6b83908) into developer (4780203) will increase coverage by 0.27%. The diff coverage is 77.77%.

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@@              Coverage Diff              @@
##           developer     #250      +/-   ##
=============================================
+ Coverage      44.72%   45.00%   +0.27%     
=============================================
  Files            147      148       +1     
  Lines          14452    14479      +27     
  Branches        1923     1923              
=============================================
+ Hits            6464     6516      +52     
+ Misses          7466     7433      -33     
- Partials         522      530       +8     

Impacted Files	Coverage Δ
tests/FSharp.Stats.Tests/Main.fs	0.00% <0.00%> (ø)
src/FSharp.Stats/Array.fs	1.31% <66.66%> (+1.31%)	:arrow_up:
tests/FSharp.Stats.Tests/Array.fs	100.00% <100.00%> (ø)
tests/FSharp.Stats.Tests/ConfidenceInterval.fs	100.00% <0.00%> (ø)
.../FSharp.Stats/Distributions/Continuous/StudentT.fs	19.44% <0.00%> (+5.55%)	:arrow_up:
src/FSharp.Stats/Distributions/Continuous.fs	54.54% <0.00%> (+31.81%)	:arrow_up:
src/FSharp.Stats/Optimization/Bisection.fs	47.61% <0.00%> (+47.61%)	:arrow_up:
src/FSharp.Stats/ConfidenceInterval.fs	100.00% <0.00%> (+100.00%)	:arrow_up:

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