feat: Scrollbar component (#315)

* feat: create Scrollbar component

* fix: fix the native scrollbar is rendered when toggling the dropdown menu at the first time

* docs: add a example, the base scrollbar in the Menu

* feat: add some props for user can customize the scrollbar

* docs: add the shadow scrollbar example

* docs: update docs for Scrollbar

* chore: work in progress

* chore: work in progress

* feat: the scrollbar default is hidden

* feat: add horizontalVisibility and verticalVisibility props

* chore: fix typo

* chore: rename some props

* feat: remove the autoHeight prop

* feat: adjust the visibility attribute of the scrollbar

* feat: add disabled prop