feat: changed SurrealWasm from extension class to regular class

Author: limcheekin

lib/src/surreal_extension.dart

@@ -2,4 +2,4 @@
 library surrealdb_wasm;
 
 export 'src/js.dart';
-export 'src/surreal_extension.dart';
+export 'src/surreal_wasm.dart';