New feature: GroupJoin

[ghost]

No description provided.

[codecov]

Codecov Report

Merging #78 into master will increase coverage by 0.21%.
The diff coverage is 97.72%.

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
+ Coverage   83.13%   83.34%   +0.21%     
==========================================
  Files          25       25              
  Lines        2970     3014      +44     
  Branches      448      452       +4     
==========================================
+ Hits         2469     2512      +43     
  Misses        371      371              
- Partials      130      131       +1

Impacted Files	Coverage Δ
...em.Linq.Dynamic.Core/DynamicQueryableExtensions.cs	96.46% <97.72%> (+0.11%)	⬆️

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[StefH]

Looks good.

Please add 1 small exception test like https://github.com/StefH/System.Linq.Dynamic.Core/blob/master/test/System.Linq.Dynamic.Core.Tests/QueryableTests.Join.cs#L153

[StefH]

Also add a negative test (throws exception) like https://github.com/StefH/System.Linq.Dynamic.Core/blob/master/test/System.Linq.Dynamic.Core.Tests/QueryableTests.Join.cs#L153

[ghost]

Test added.