Specify dropdownAlign to something else then any as it inherits the type from rc-trigger

Currently in Select types the prop dropdownAlign is typed as any. But rc-trigger anyway has the type specified more specifically.

Here is types for popupAlign from rc-trigger:
https://github.com/react-component/trigger/blob/240f5a568bf7743c42065809f3c219a62856d8f7/src/interface.ts#L4-L42

Should we include the AlignType here? I think it would make sense.
