Revert pooling and array segment stuff

[codecov[bot]]

Codecov Report

Merging #168 (4f99b47) into master (2adb275) will decrease coverage by 0.38%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #168      +/-   ##
==========================================
- Coverage   93.44%   93.06%   -0.39%     
==========================================
  Files         107       99       -8     
  Lines        7627     7107     -520     
  Branches      670      640      -30     
==========================================
- Hits         7127     6614     -513     
+ Misses        375      371       -4     
+ Partials      125      122       -3     

Impacted Files	Coverage Δ
src/FlatSharp.Compiler/MetadataHelpers.cs	89.47% <ø> (-1.01%)	:arrow_down:
src/FlatSharp.Compiler/MetadataKeys.cs	100.00% <ø> (ø)
...tSharp.Compiler/TypeDefinitions/FieldDefinition.cs	91.59% <ø> (-0.04%)	:arrow_down:
...arp.Compiler/TypeDefinitions/RootNodeDefinition.cs	100.00% <ø> (ø)
...ompiler/TypeDefinitions/TableOrStructDefinition.cs	94.25% <ø> (-0.13%)	:arrow_down:
src/FlatSharp.Compiler/Visitors/TypeVisitor.cs	100.00% <ø> (ø)
...rc/FlatSharp.Runtime/GeneratedSerializerWrapper.cs	77.57% <ø> (-0.51%)	:arrow_down:
src/FlatSharp.Runtime/VectorCloneHelpers.cs	89.15% <ø> (+3.57%)	:arrow_up:
src/FlatSharp/Serialization/CodeGeneratedMethod.cs	100.00% <ø> (ø)
...rc/FlatSharp/Serialization/ParserCodeGenContext.cs	84.00% <ø> (-16.00%)	:arrow_down:
... and 17 more

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