feat(funnel): add funnel new styles and props

[pe-3]

related pull request #14863

• feat(funnel): set prop to flatten the funnel exit.
• feat(funnel): set prop to make funnel piece height dynamic.
• feat(funnel): set prop to make dynamic height funnel more thicker.
• feat(funnel): set prop to show funnel transform rate.
• feat(funnel): set prop to let each data take funnel's area.
• feat(funnel): use formatter to set funnel rate label.

[Ovilia]

Please make this a draft PR before the ECharts PR is merged.