Wrappers to create VDom input fields using field ids.

`val text : State.t ‑> string Id.t ‑> Incr_dom.Vdom.Attr.t list ‑> Incr_dom.Vdom.Node.t`
`val textarea : State.t ‑> string Id.t ‑> Incr_dom.Vdom.Attr.t list ‑> Incr_dom.Vdom.Node.t`
`val checkbox : State.t ‑> bool Id.t ‑> Incr_dom.Vdom.Attr.t list ‑> Incr_dom.Vdom.Node.t`
`val radio_button : State.t ‑> 'a Variant_id.t ‑> Incr_dom.Vdom.Attr.t list ‑> ('a * Incr_dom.Vdom.Node.t) list`
`val dropdown : State.t ‑> 'a Variant_id.t ‑> Incr_dom.Vdom.Attr.t list ‑> ?⁠compare:('a ‑> 'a ‑> int) ‑> ('a ‑> string) ‑> Incr_dom.Vdom.Node.t`

Dropdown for all initially provided values optionally sorted using the provided compare function.