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/Server/Serialization/IGenericWriter.cs

@@ -16,6 +16,7 @@
 using System;
 using System.IO;
 using System.Net;
+using Server.Collections;
 
 namespace Server
 {
@@ -160,6 +161,8 @@ namespace Server
             Write(stack);
         }
 
+        void Write(BitArray bitArray);
+
         long Seek(long offset, SeekOrigin origin);
     }
 }