feat(SelectTree): SelectTree有ShowSearch参数，漏掉OnSearchAsync参数

[Tony-ST0754]

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Is your feature request related to a problem? Please describe the problem.

SelectTree有ShowSearch参数，漏掉OnSearchAsync参数

Describe the solution you'd like

补齐OnSearchAsync参数后，让ShowSearch为true时，能完整实现搜索功能

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