fix(FloatingPanel): fix stuck during indetermine direction

[luo3house]

iOS: if touch events triggered but touch direction not recognized by getDirection, then

1. FloatingPanel(FP) treat this touch as dragging and prevent it.
2. Until direction recognized and we try to scroll content, FP think it is not dragging then expectedly ignore
3. But the first touch move event is prevented, subsequent events are not active for content scrolling.

Reproduction: https://react-vant-pr-627.surge.sh/~demo/components/floating-panel

1. Scroll panel to max anchor
2. Try scroll content
3. Get stuck sometimes.

[github-actions[bot]]

PR preview has been successfully built and deployed to https://react-vant-pr-631.surge.sh.

[github-actions[bot]]

PR preview has been successfully built and deployed to https://react-vant-pr-631.surge.sh.

[github-actions[bot]]

PR preview has been successfully built and deployed to https://react-vant-pr-631.surge.sh.

[github-actions[bot]]

PR preview has been successfully built and deployed to https://react-vant-pr-631.surge.sh.

[github-actions[bot]]

PR preview has been successfully built and deployed to https://react-vant-pr-631.surge.sh.

[3lang3]

好兄弟，我没时间review了，确定我明天就合完发版了

[luo3house]

好兄弟，我没时间review了，确定我明天就合完发版了

辛苦了，draft 转 ready 通常表示ok

这条 PR 主要解决 touch 方向读不出来 ( useTouch 需要 MIN_DISTANCE )，而提前阻止了事件导致卡住的问题。

[LarryHangFan]

没人碰到FloatingPanel内的元素滚动失效了，滚动触发的是拖拽，

这两个属性开放很有必要的