Describe the bug
When createUploaderComponent has been created, emits specification only described the usage as an array (eg. ['update:label', 'change']), later on they added the ability to provide an object for stricter type checking and validation, very much like props.
Currently createUploaderComponent only supports emits as an array and props as an object

Codepen/jsFiddle/Codesandbox (required)
Fork a Codepen (https://codepen.quasar.dev) or a jsFiddle (https://jsfiddle.quasar.dev) or a Codesandbox (https://codesandbox.quasar.dev) and hit save then copy-paste link here.

To Reproduce
Steps to reproduce the behavior:

import { createUploaderComponent } from 'quasar';
import myUploaderPlugin from './my-uploader-plugin';

export default createUploaderComponent({
  name: 'MyUploader',
  emits: {
    'change': (newValue: string) => true
  },
  injectPlugin: myUploaderPlugin,
});

then use the component anywhere and a warning (at least) will be fired

Expected behavior
props and emits should support both Array and Object styles

Platform (please complete the following information):
Quasar Version: 2.x
@quasar/app Version: 3.x

Quasar mode:

• SPA
• SSR
• PWA
• Electron
• Cordova
• Capacitor
• BEX

Tested on:

• SPA
• SSR
• PWA
• Electron
• Cordova
• Capacitor
• BEX

OS: Linux 18.04
Node: 12.22.6
NPM: 6.14.15
Yarn: 1.22.5