Move some extension methods into their respective class files

PluralKit.Core/Database/Database.cs

@@ -197,4 +197,19 @@ namespace PluralKit.Core
             public override T[] Parse(object value) => Array.ConvertAll((TInner[]) value, v => _factory(v));
         }
     }
+    
+    public static class DatabaseExt
+    {
+        public static async Task Execute(this IDatabase db, Func<IPKConnection, Task> func)
+        {
+            await using var conn = await db.Obtain();
+            await func(conn);
+        }
+        
+        public static async Task<T> Execute<T>(this IDatabase db, Func<IPKConnection, Task<T>> func)
+        {
+            await using var conn = await db.Obtain();
+            return await func(conn);
+        }
+    }
 }

PluralKit.Core/Database/DatabaseExt.cs

@@ -1,20 +0,0 @@
-using System;
-using System.Threading.Tasks;
-
-namespace PluralKit.Core
-{
-    public static class DatabaseExt
-    {
-        public static async Task Execute(this IDatabase db, Func<IPKConnection, Task> func)
-        {
-            await using var conn = await db.Obtain();
-            await func(conn);
-        }
-        
-        public static async Task<T> Execute<T>(this IDatabase db, Func<IPKConnection, Task<T>> func)
-        {
-            await using var conn = await db.Obtain();
-            return await func(conn);
-        }
-    }
-}