fix: Adds GetClients to map iterators (#1574)

### Summary

Eliminates `IPooledEnumerable<NetState>` and `eable.Free()` from `Map` for clients. This drastically simplifies code that iterates in range, for example:

```cs
foreach (var m in m.GetClientsInRange(5))
{
}
```
The code above no longer requires an eable and calling `Free()`.

Projects/UOContent/Engines/Doom/LeverPuzzle/LeverPuzzleController.cs

@@ -505,9 +505,7 @@ public partial class LeverPuzzleController : Item
     {
         Span<byte> buffer = stackalloc byte[OutgoingMessagePackets.GetMaxMessageLength(Msgs[index])].InitializePacket();
 
-        var eable = from.Map.GetClientsInRange(from.Location);
-
-        foreach (var state in eable)
+        foreach (var state in from.Map.GetClientsInRange(from.Location))
         {
             var length = OutgoingMessagePackets.CreateMessage(
                 buffer,