feat: support canvas universal api

[SoloJiang]

import { createElement, useEffect, Fragment } from 'rax';
import { createContext } from 'universal-canvas';

function App() {
  useEffect({
    createContext('canvas', '2d').then(context => {
      context.fillStyle = 'red';
      context.fillRect(0, 0, 100, 100);
      context.draw();
    });
  }, []);

  return (<>
    <canvas id='canvas'></canvas>
  </>)
}

[fyangstudio]

这个 object 最好 interface 再描述下

[ChrisCindy]

id 名称改一下，避免误导用户