New interface

[mayer79]

This PR solves the old wish to have a more R-like output behaviour of missRanger(): Setting data_only = FALSE will return an object of class "missRanger" with print() and summary() method and a couple of information attached that can be extracted via $.

Furthermore, setting keep_forests = TRUE will attach the random forests used to impute the data.

The PR will solve #54 and #28

[codecov-commenter]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (ac24bae) 97.35% compared to head (dce5aea) 93.30%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
- Coverage   97.35%   93.30%   -4.06%     
==========================================
  Files           4        5       +1     
  Lines         189      224      +35     
==========================================
+ Hits          184      209      +25     
- Misses          5       15      +10     

Files	Coverage Δ
R/methods.R	100.00% <100.00%> (ø)
R/missRanger.R	91.08% <84.05%> (-5.96%)	⬇️

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