Wrap DbTransaction too

PluralKit.Core/Database/Wrappers/IPKTransaction.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Data;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace PluralKit.Core
+{
+    public interface IPKTransaction: IDbTransaction, IAsyncDisposable
+    {
+        public Task CommitAsync(CancellationToken ct = default);
+        public Task RollbackAsync(CancellationToken ct = default);
+    }
+}