Fixes following issues:

1. Google play billing method(OnGodotGooglePlayBilling_sku_details_query_error) signature in GooglePlayBilling class doesn't match with Godot's android library exposed method
Check: https://github.com/godotengine/godot-google-play-billing/blob/master/godot-google-play-billing/src/main/java/org/godotengine/godot/plugin/googleplaybilling/GodotGooglePlayBilling.java
Line: 236.

2. "OnConnectError" method signature mismatch

Author: shahediqbal13

mono/android_iap/GodotGooglePlayBilling/GooglePlayBilling.cs

@@ -15,7 +15,7 @@ public class GooglePlayBilling : Node
         [Signal] public delegate void Disconnected();
         [Signal] public delegate void ConnectError(int code, string message);
         [Signal] public delegate void SkuDetailsQueryCompleted(Array skuDetails);
-        [Signal] public delegate void SkuDetailsQueryError(int code, string message);
+        [Signal] public delegate void SkuDetailsQueryError(int code, string message, string[] querySkuDetails);
         [Signal] public delegate void PurchasesUpdated(Array purchases);
         [Signal] public delegate void PurchaseError(int code, string message);
         [Signal] public delegate void PurchaseAcknowledged(string purchaseToken);
@@ -96,7 +96,7 @@ public PurchasesResult QueryPurchases(PurchaseType purchaseType)
 
         private void OnGodotGooglePlayBilling_sku_details_query_completed(Array skuDetails) => EmitSignal(nameof(SkuDetailsQueryCompleted), skuDetails);
 
-        private void OnGodotGooglePlayBilling_sku_details_query_error(int code, string message) => EmitSignal(nameof(SkuDetailsQueryError), code, message);
+        private void OnGodotGooglePlayBilling_sku_details_query_error(int code, string message, string[] querySkuDetails) => EmitSignal(nameof(SkuDetailsQueryError), code, message, querySkuDetails);
 
         private void OnGodotGooglePlayBilling_purchases_updated(Array purchases) => EmitSignal(nameof(PurchasesUpdated), purchases);
 

mono/android_iap/Main.cs

@@ -93,7 +93,7 @@ private async void OnDisconnected()
             _payment.StartConnection();
         }
 
-        private void OnConnectError()
+        private void OnConnectError(int code, string message)
         {
             ShowAlert("PurchaseManager connect error");
         }
@@ -136,7 +136,7 @@ private void OnSkuDetailsQueryCompleted(Godot.Collections.Array arrSkuDetails)
             }
         }
 
-        private void OnSkuDetailsQueryError(int code, string message)
+        private void OnSkuDetailsQueryError(int code, string message, string[] querySkuDetails)
         {
             ShowAlert($"SKU details query error {code}: {message}");
         }