Explicitly set license for nuget through PackageLicenseExpression

[ax-meyer]

What does this PR do?

Switches from using the license file to indicate the license in the nuget package to using PackageLicenseExpression to explicitly define the license for the nugets.

Why is it important?

This allows

• Allows tools like nuget-license (https://github.com/sensslen/nuget-license) to automatically detect the license of a package - currently we need to configure manual overrides and update the version in the override each time morelinq gets updated
• nuget.org to show the license in the sidebar directly like this (see here: https://www.nuget.org/packages/dotnet-ef)
  

How to test this PR

Manual test:

• Run nuget pack for the project
• Start manual upload process for a nuget here: https://www.nuget.org/packages/manage/upload
• The page will show the package metadata with license information for verification before finishing the upload

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.28%. Comparing base (422a54f) to head (332753b).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1095   +/-   ##
=======================================
  Coverage   93.28%   93.28%           
=======================================
  Files         113      113           
  Lines        3439     3439           
  Branches      969      969           
=======================================
  Hits         3208     3208           
  Misses        215      215           
  Partials       16       16           

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[kchenery]

Hi,
Any reason this has not been merged yet?

cc @atifaziz

[atifaziz]

Hi, Any reason this has not been merged yet?

@kchenery Sorry, lack of time, but should managed to get it merged this week.