fix(tooltip): fix some issues in new tooltip.

Avoid states transition stops update animation.

fix(toolbox): fix the bug of overriding title when click the stack button

feat(tooltip): allow adding classes to tooltip DOM and migrate changes to next branch in #12834.

(1) `transform` may not be working in IE. (add vendor prefixes)
(2) disable transition only when tooltip shows arrow.
(3) reduce unnecessary imports.

[5.0] [Feature] sunburst series supports cornerRadius

[5.0] [Feature] pie series supports cornerRadius & innerCornerRadius.

* See https://github.com/apache/incubator-echarts/pull/12834

Merge from master to next