Remove fs_nonVirtual support

[codecov[bot]]

Codecov Report

Merging #343 (646ec32) into main (c899b84) will increase coverage by 0.00%. The diff coverage is 81.81%.

@@           Coverage Diff           @@
##             main     #343   +/-   ##
=======================================
  Coverage   96.13%   96.13%           
=======================================
  Files         108      108           
  Lines        8045     7997   -48     
  Branches      746      735   -11     
=======================================
- Hits         7734     7688   -46     
+ Misses        209      206    -3     
- Partials      102      103    +1     

Impacted Files	Coverage Δ
src/FlatSharp.Compiler/MetadataKeys.cs	100.00% <ø> (ø)
src/FlatSharp.Compiler/Schema/EnumVal.cs	100.00% <ø> (ø)
...mpiler/SchemaModel/BaseReferenceTypeSchemaModel.cs	100.00% <ø> (ø)
...ompiler/SchemaModel/FlatSharpAttributeValidator.cs	98.75% <ø> (-0.08%)	:arrow_down:
...tSharp.Compiler/SchemaModel/FlatSharpAttributes.cs	98.86% <ø> (-0.02%)	:arrow_down:
...Compiler/SchemaModel/MutableFlatSharpAttributes.cs	87.50% <ø> (-0.50%)	:arrow_down:
...iler/SchemaModel/StructVectorPropertyFieldModel.cs	96.35% <ø> (-0.03%)	:arrow_down:
src/FlatSharp/TypeModel/StructMemberModel.cs	79.31% <ø> (-1.94%)	:arrow_down:
src/FlatSharp/TypeModel/TableMemberModel.cs	93.75% <ø> (-0.13%)	:arrow_down:
src/FlatSharp/TypeModel/ItemMemberModel.cs	94.33% <60.00%> (+2.55%)	:arrow_up:
... and 5 more

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