feat(collapsible): add animation to collapsible component

[cxa]

Make collapsible animation.

[vercel]

@cxa is attempting to deploy a commit to the shadcn-pro Team on Vercel.

A member of the Team first needs to authorize it.

[shadcn]

@cxa This is intended. The idea is to make it behave differently from accordion.

See also https://www.radix-ui.com/primitives/docs/components/collapsible

If you want to add animation, it can be done in user land or we can cover it in docs.