[Feature] funnel transform label support position of label

[xile611]

What problem does this feature solve?

What does the proposed API look like?

https://www.visactor.io/vchart/option/funnelChart#transformLabel.limit(number%7C'shapeSize')

{
  transformLabel: {
    position?: 'left' | 'right' | 'center' | 'top' | 'right' | 'inside-left' | 'inside-right' | 'inside-top' | 'inside-bottom'
  }
}