feat: Adds a memory mirrored ring buffer for networking. (#1533)

## Breaking Changes

Incoming packet registration signature has changed to:
```cs
delegate* void OnReceiveCallback(NetState state, SpanReader reader, int packetLength);

IncomingPackets.Register(int packetID, int length, bool ingame, OnReceiveCallback onReceive);
```

For example, an incoming packet handler signature would now look like this:
```cs
public static void SomeIncomingPacket(NetState state, SpanReader reader, int packetLength)
{
    // Parse the data
}
```

## Summary

Updates the network Pipe class to use a mirrored memory technique. This technique involves mapping the same physical memory to two contiguous virtual memory spaces so the byte buffer appears duplicated. This allows writing to a double-sized array to wrap around without the need for the `CircularBuffer` classes.

In practice this allows us to use `Span<byte>` as if the buffer was a regular array.


### Bug Fixes

- [X] Fixes bad fixed length string parsing

Projects/Server/Network/EncodedReader.cs

@@ -13,15 +13,17 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  *************************************************************************/
 
+using System.Buffers;
+
 namespace Server.Network;
 
 public ref struct EncodedReader
 {
-    private CircularBufferReader _reader;
+    private SpanReader _reader;
 
-    public EncodedReader(CircularBufferReader reader) => _reader = reader;
+    public EncodedReader(SpanReader reader) => _reader = reader;
 
-    public void Trace(NetState state) => _reader.Trace(state);
+    public void Trace(NetState state) => state.Trace(_reader.Buffer);
 
     public int ReadInt32() => _reader.ReadByte() != 0 ? 0 : _reader.ReadInt32();