LAPP-57 unify analytics projects

[cgalan-applaudostudios]

This aims to simplify the structure of the projects. We obtain as benefice that we can use DotNet CLI to generate the Nuget Package. Also because the project contains all the targets, the Nuget Package is easer to create.

This will remove this warning:

[NU1701] Package 'Analytics 3.0.0' was restored using '.NETFramework,Version=v4.6.1' instead of the project target framework '.NETCoreApp,Version=v2.1'. This package may not be fully compatible with your project.

[codecov-io]

Codecov Report

Merging #126 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #126   +/-   ##
=======================================
  Coverage   85.14%   85.14%           
=======================================
  Files          26       26           
  Lines         801      801           
  Branches       80       80           
=======================================
  Hits          682      682           
  Misses        112      112           
  Partials        7        7           

Impacted Files	Coverage Δ
Analytics/Flush/AsyncFlushHandler.cs	87.77% <ø> (ø)
Analytics/Flush/BlockingQueue.cs	83.33% <ø> (ø)

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