feat(event): emit plot events

[pearmini]

Plot Event

支持监听 plot event.

开始使用

import { Chart } from '@antv/g2';

const chart = new Chart({
  container: 'container',
  theme: 'classic',
  autoFit: true,
});

chart
  .interval()
  .data({
    type: 'fetch',
    value:
      'https://gw.alipayobjects.com/os/bmw-prod/fb9db6b7-23a5-4c23-bbef-c54a55fee580.csv',
  })
  .encode('x', 'letter')
  .encode('y', 'frequency')
  .axis('y', { labelFormatter: '.0%' });

chart.render();

chart.on('plot:click', () => console.log('plot'));