Add source link package reference

[kMutagene]

• Add source link package reference to the project file (see https://github.com/dotnet/sourcelink#githubcom-and-github-enterprise)
• make build task mandatory for pack task

[codecov-io]

Codecov Report

Merging #99 (0c40566) into developer (c76af47) will increase coverage by 0.25%. The diff coverage is n/a.

@@              Coverage Diff              @@
##           developer      #99      +/-   ##
=============================================
+ Coverage      19.39%   19.64%   +0.25%     
=============================================
  Files            106      106              
  Lines          11283    11283              
  Branches        2478     2478              
=============================================
+ Hits            2188     2217      +29     
- Misses          8925     8971      +46     
+ Partials         170       95      -75     

Impacted Files	Coverage Δ
src/FSharp.Stats/Seq.fs	0.00% <0.00%> (ø)
src/FSharp.Stats/List.fs	0.00% <0.00%> (ø)
src/FSharp.Stats/Array.fs	0.00% <0.00%> (ø)
src/FSharp.Stats/Vector.fs	2.42% <0.00%> (ø)
src/FSharp.Stats/Intervals.fs	0.00% <0.00%> (ø)
src/FSharp.Stats/Permutation.fs	26.92% <0.00%> (ø)
src/FSharp.Stats/ServiceLocator.fs	0.00% <0.00%> (ø)
src/FSharp.Stats/Distributions/Distance.fs	40.65% <0.00%> (ø)
...Sharp.Stats/Algebra/LinearAlgebraServiceManaged.fs	9.52% <0.00%> (ø)
src/FSharp.Stats/Distributions/Continuous.fs	15.43% <0.00%> (+0.23%)	:arrow_up:
... and 5 more

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