feat(Cascader): add `IsClearable` parameter

[ice6]

Is there an existing issue for this?

• I have searched the existing issues

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

OK, I found that all the selectable and inputable control need this function. otherwise the user experience is not consistant, make user frustrated.

Describe the solution you'd like

as title described.

Additional context

No response

[bb-auto]

@ice6 Thank you for contacting us. We will give feedback later.

[ice6]

so cool 👍