feat: Upgrades serialization v4 (Threaded Heap Serialization) (#1947)

### Summary

- `GenericEntityPersistence` is now a type of `GenericPersistence`. This allows developers to serialize both entities and non-entities in the same system. 🎉
- Each `SerializationThreadWorker` now allocates 1MB of heap for serialization _permanently_. If more memory is needed, that thread will double it's memory, not to exceed increments of 64MB.
- Several bugs with serialization introduced with the pure MMF implementation have been fixed.
- `BinaryFileReader` has been added back. 🎉
- Adds `world.useMultithreadedSaves` to allow disabling threaded saves.

> [!IMPORTANT]
> **Developer Note**
> The split file serialization has been deprecated and is no longer used. We have effectively gone back to the same file writing we had before the pure MMF implementation.

Projects/UOContent/Accounting/Account.cs

@@ -284,6 +284,10 @@ public partial class Account : IAccount, IComparable<Account>
 
     public Serial Serial { get; set; }
 
+    public byte SerializedThread { get; set; }
+    public int SerializedPosition { get; set; }
+    public int SerializedLength { get; set; }
+
     [AfterDeserialization(false)]
     private void AfterDeserialization()
     {