Remove option for 'UseDynamicObjectClassForAnonymousTypes'

[StefH]

#164

[codecov]

Codecov Report

Merging #353 into master will increase coverage by 0.26%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #353      +/-   ##
=========================================
+ Coverage   88.13%   88.4%   +0.26%     
=========================================
  Files          46      46              
  Lines        4500    4484      -16     
=========================================
- Hits         3966    3964       -2     
+ Misses        534     520      -14

Impacted Files	Coverage Δ
...ystem.Linq.Dynamic.Core/Parser/ExpressionParser.cs	87.82% <ø> (+0.92%)	⬆️
src/System.Linq.Dynamic.Core/ParsingConfig.cs	100% <ø> (ø)	⬆️

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