feat: adding preprocessor for select functions

[petereon]

Changes:

• Adding preprocessor callable parameter to select
• Adding preprocessor callable parameter to select_multiple

Issue #3

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #22 (fc1fee5) into master (d79c075) will increase coverage by 0.06%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   95.93%   96.00%   +0.06%     
==========================================
  Files           2        2              
  Lines         197      200       +3     
  Branches       62       64       +2     
==========================================
+ Hits          189      192       +3     
  Misses          2        2              
  Partials        6        6              

Flag	Coverage Δ
unittests	96.00% <100.00%> (+0.06%)	:arrow_up:

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Impacted Files	Coverage Δ
beaupy/beaupy.py	95.42% <100.00%> (+0.07%)	:arrow_up:

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