C#: Generate signal delegates with typed arrays

[raulsntos]

I found out we were generating the C# signal delegates without using the type generic parameters. This means for a signal with a parameter of type TypedArray<StringName> we were using type Array. The signal delegate generation now matches the method generation more closely.

Changing this would normally break compatibility, luckily there's only one signal in Godot that uses a generic type (GraphEdit::delete_nodes_request) and GraphEdit is marked experimental.

Also took the opportunity to remove an unused String in the C# bindings generator: delegate_type_params.

[paulloz]

Everything seem to work as intended. Looks good to me 👍

Here is the full diff on the generated glue.

--- GraphEdit.cs        2024-09-22 11:30:00.947689600 +0200
+++ GraphEdit.cs        2024-09-22 11:24:14.966598300 +0200
@@ -1308,12 +1308,12 @@
     /// <summary>
     /// Represents the method that handles the <see cref="Godot.GraphEdit.DeleteNodesRequest"/> event of a <see cref="Godot.GraphEdit"/> 
class.
     /// </summary>
-    public delegate void DeleteNodesRequestEventHandler(Godot.Collections.Array nodes);
+    public delegate void DeleteNodesRequestEventHandler(Godot.Collections.Array<StringName> nodes);
 
     private static void DeleteNodesRequestTrampoline(object delegateObj, NativeVariantPtrArgs args, out godot_variant ret)
     {
         Callable.ThrowIfArgCountMismatch(args, 1);
-        ((DeleteNodesRequestEventHandler)delegateObj)(VariantUtils.ConvertToArray(args[0]));
+        ((DeleteNodesRequestEventHandler)delegateObj)(new Godot.Collections.Array<StringName>(VariantUtils.ConvertToArray(args[0])));    
         ret = default;
     }

[akien-mga]

Thanks!