Imputation

[egillax]

Add imputation methods for numeric covariates. Marked as experimental for the time being.

• simpleImputer : use mean or median to impute missing values in features > missingThreshold
• iterativeImputer: use iterative imputing by chained equation (ICE). Implemented predictive mean matching 'pmm'.

[codecov]

Codecov Report

Attention: Patch coverage is 3.10881% with 561 lines in your changes missing coverage. Please review.

Project coverage is 82.62%. Comparing base (fbea755) to head (362898c).

Files with missing lines	Patch %	Lines
R/Imputation.R	0.00%	426 Missing ⚠️
R/PreprocessingData.R	8.78%	135 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #513      +/-   ##
===========================================
- Coverage    87.03%   82.62%   -4.42%     
===========================================
  Files           50       51       +1     
  Lines        10477    11042     +565     
===========================================
+ Hits          9119     9123       +4     
- Misses        1358     1919     +561     

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