Support nan/inf default values

[mattico]

These are allowed in the FlatBuffer schema language.

[jamescourtney]

Thank you for this! I hadn't even considered this. Appreciate you putting together a PR with tests. I'll take a look this weekend.

[codecov]

Codecov Report

Merging #284 (9123072) into main (8881a32) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #284      +/-   ##
==========================================
- Coverage   95.63%   95.63%   -0.01%     
==========================================
  Files         113      113              
  Lines        7587     7598      +11     
  Branches      703      706       +3     
==========================================
+ Hits         7256     7266      +10     
  Misses        230      230              
- Partials      101      102       +1     

Impacted Files	Coverage Δ
...atSharp.Compiler/SchemaModel/PropertyFieldModel.cs	92.69% <100.00%> (+0.38%)	⬆️
src/FlatSharp/FlatBufferSerializer.cs	89.00% <0.00%> (-1.00%)	⬇️

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