Added EvaluateGroupByAtDatabase For EF Core 2.1

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #197 into master will decrease coverage by 0.06%.
The diff coverage is 87.5%.

@@            Coverage Diff            @@
##           master    #197      +/-   ##
=========================================
- Coverage   82.86%   82.8%   -0.07%     
=========================================
  Files          37      37              
  Lines        3671    3663       -8     
  Branches      495     495              
=========================================
- Hits         3042    3033       -9     
  Misses        498     498              
- Partials      131     132       +1

Impacted Files	Coverage Δ
src/System.Linq.Dynamic.Core/ParsingConfig.cs	94.11% <100%> (+2.45%)	⬆️
...em.Linq.Dynamic.Core/DynamicQueryableExtensions.cs	96.79% <50%> (-0.14%)	⬇️
...ystem.Linq.Dynamic.Core/Parser/ExpressionParser.cs	77.98% <0%> (-0.24%)	⬇️

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