props of options.column.style can be a function with param task

[lyttonlee]

changes

its help user easy to render a different row style by some task attr

     {
        id: 3,
        label: 'start',
        value: task => {
          return dayjs(task.start).format('YYYY-MM-DD')
        },
        width: 100,
        style: task => computeStyle(task.styleType)
      },
      {
        id: 4,
        label: 'progress',
        value: task => moment.duration(task.duration, 'ms').asDays() + '天',
        width: 68,
        style: {
          'task-list-header-label': {
            'text-align': 'center',
            width: '100%'
          },
          'task-list-item-value-container': {
            'text-align': 'center',
            width: '100%',
            cursor: 'pointer',
          },
          'task-list-item-value': {
            'text-decoration': 'line-through',
            color: '#789'
          }
        }