fix(NumberKeyboard): fix IOS missing the touch event when finger trigger the scale case

[zombieJ]

IOS 里手指在边缘按下拖动时会导致 touchend 事件被吞，加一个兜底。如果发现有新的 touchstart 事件出来，那过去的循环清理则直接杀掉。

[github-actions]

Size Change: +3 B (0%)

Total Size: 355 kB

Filename	Size	Change
./lib/bundle/antd-mobile.compatible.umd.js	191 kB	+3 B (0%)

ℹ️ View Unchanged

Filename	Size
./lib/bundle/antd-mobile.umd.js	145 kB
./lib/bundle/css-vars-patch.css	1.42 kB
./lib/bundle/style.css	18 kB

_{compressed-size-action}

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
./lib/bundle/antd-mobile.es.js	102.44 KB	2.1 s (0%)	1.1 s (+3.95% 🔺)	3.2 s

[github-actions]

PR preview has been successfully built and deployed to https://antd-mobile-preview-pr-6651.surge.sh