Remove init-only setters for full .NET Standard / .NET Framework compatibility

[Shane32]

Target Parser 10.x ??

[codecov-commenter]

Codecov Report

Merging #319 (9f27cd5) into master (f11f0d2) will not change coverage.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##           master     #319   +/-   ##
=======================================
  Coverage   96.23%   96.23%           
=======================================
  Files          85       85           
  Lines        4892     4892           
  Branches      477      477           
=======================================
  Hits         4708     4708           
  Misses        184      184           

Impacted Files	Coverage Δ
src/GraphQLParser/Visitors/CountVisitor.cs	100.00% <100.00%> (ø)
src/GraphQLParser/Visitors/MaxDepthVisitor.cs	100.00% <100.00%> (ø)
src/GraphQLParser/Visitors/SDLPrinter.cs	99.74% <100.00%> (ø)
src/GraphQLParser/Visitors/StructurePrinter.cs	100.00% <100.00%> (ø)

[sungam3r]

I would not. Moreover, I would not treat init with such caution. We have not yet written a single issue about problems with init. Nevertheless, I'm OK to merge this one as is.