Refactor exceptions and string concat

[jamescourtney]

No description provided.

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (6260caf) 97.31% compared to head (b78e882) 97.01%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #420      +/-   ##
==========================================
- Coverage   97.31%   97.01%   -0.31%     
==========================================
  Files         126      126              
  Lines        9698     9735      +37     
  Branches      786      787       +1     
==========================================
+ Hits         9438     9444       +6     
- Misses        169      200      +31     
  Partials       91       91              

Files	Coverage Δ
...harp.Compiler/SchemaModel/RpcServiceSchemaModel.cs	98.98% <100.00%> (ø)
...iler/SchemaModel/StructVectorPropertyFieldModel.cs	96.40% <100.00%> (ø)
...arp.Compiler/SchemaModel/ValueStructSchemaModel.cs	94.48% <100.00%> (+0.03%)	⬆️
...harp.Compiler/SchemaModel/ValueUnionSchemaModel.cs	96.95% <100.00%> (ø)
src/FlatSharp.Runtime/FlatSharpInternal.cs	87.50% <100.00%> (+12.50%)	⬆️
src/FlatSharp.Runtime/IO/InputBufferExtensions.cs	96.07% <100.00%> (-0.22%)	⬇️
src/FlatSharp.Runtime/IO/SpanWriterExtensions.cs	95.55% <ø> (ø)
src/FlatSharp.Runtime/SerializationHelpers.cs	93.10% <100.00%> (-0.84%)	⬇️
src/FlatSharp.Runtime/SerializerSettings.cs	97.29% <100.00%> (-2.71%)	⬇️
src/FlatSharp.Runtime/SortedVectorHelpers.cs	98.80% <100.00%> (-0.60%)	⬇️
... and 24 more

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