[WIP] Multiplex reporting

[Alexander-Sol]

Small refactor to multiplex ion quantification to increase speed and code quality. Introduced MultiplexMod class to handle all multiplex operations.

[codecov[bot]]

Codecov Report

Merging #2286 (ebbddb4) into master (2729265) will decrease coverage by 0.01%. The diff coverage is 99.01%.

@@            Coverage Diff             @@
##           master    #2286      +/-   ##
==========================================
- Coverage   91.92%   91.92%   -0.01%     
==========================================
  Files         133      134       +1     
  Lines       20272    20290      +18     
  Branches     2824     2826       +2     
==========================================
+ Hits        18635    18651      +16     
- Misses       1156     1157       +1     
- Partials      481      482       +1     

Impacted Files	Coverage Δ
MetaMorpheus/EngineLayer/Mods/MultiplexMod.cs	98.64% <98.64%> (ø)
MetaMorpheus/EngineLayer/PeptideSpectralMatch.cs	98.84% <100.00%> (+0.01%)	:arrow_up:
...eus/TaskLayer/SearchTask/PostSearchAnalysisTask.cs	92.73% <100.00%> (-0.32%)	:arrow_down:

... and 1 file with indirect coverage changes