Wrap all constant expressions to fix Parameterized SQL (#247)

[StefH]

#247

[codecov]

Codecov Report

Merging #250 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #250      +/-   ##
==========================================
+ Coverage   96.57%   96.57%   +<.01%     
==========================================
  Files          41       41              
  Lines        6919     6925       +6     
==========================================
+ Hits         6682     6688       +6     
  Misses        237      237

Impacted Files	Coverage Δ
...q.Dynamic.Core/Parser/ConstantExpressionWrapper.cs	100% <100%> (ø)	⬆️
...ystem.Linq.Dynamic.Core/Parser/ExpressionParser.cs	98.6% <100%> (ø)	⬆️
...ystem.Linq.Dynamic.Core/Parser/ExpressionHelper.cs	100% <100%> (ø)	⬆️

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