fix(exports): add a named export for userEvent

References #1146

src/index.ts

@@ -1,4 +1,7 @@
+// the default export is kept for backward compatibility only...
 export {userEvent as default} from './setup'
+
+export {userEvent} from './setup'
 export type {UserEvent} from './setup/setup'
 export type {keyboardKey} from './system/keyboard'
 export type {pointerKey} from './system/pointer'