[Feature] - add label position to the data-zoom slider

[marcosmvrg]

What problem does this feature solve?

add a way to define the position of the label in the data zoom slider. today the label always be at the right or left of scroll bar.

What does the proposed API look like?

add a option inside of the dataZoom property like labelPosition: left, right, top or bottom for each side of the scroll bar.

[platozzZ]

I need too

[hongdeyuan]

I need too...