fix: Adds BitArray support with codegen (#888)

* Adds a custom BitArray class with the following added features:
  * ctor for creating BitArray against read only span
  * ctor for creating BitArray against BinaryReader
  * CopyTo to copy a BitArray to a Span
* Adds BitArray to UO Primitive serialization so it can be codegenned.

Projects/SerializationGenerator/SerializableMigration/Rules/PrimitiveUOTypeMigrationRule.cs

@@ -43,6 +43,7 @@ namespace SerializableMigration
                 _ when symbol.IsRectangle3D(compilation) => new[] { "Rect3D" },
                 _ when symbol.IsRace(compilation)        => new[] { "Race" },
                 _ when symbol.IsMap(compilation)         => new[] { "Map" },
+                _ when symbol.IsBitArray(compilation)    => new[] { "BitArray" },
                 _ => null
             };