Feature request: persist route (don't unmount when navigate out)

Describe the bug

Not a bug, but no templates for feature requests.

I want to be able to avoid rerendering a previously visited route and the route should keep all the internal state.

"persist?: boolean" prop would be nice
Syntax proposal:

<Routes><Route path="/" persist element={...} /> </Routes>

The way I accomplish it right now:

        <Routes>
          <Route path="/" element={<Home />} />
          <Route path="/stack" />
          ...
        </Routes>
        <PersistRoute path="/stack" component={StackTest} />


export const PersistRoute = (p: { path: string; component: FC }) => {
  const match = useMatch(() => p.path)

  let dispose: () => void | undefined
  const render = once(() => {
    return createRoot(_dispose => {
      dispose = _dispose
      return <p.component />
    })
  })

  onCleanup(() => dispose?.())

  return <Show when={match()}>{render()}</Show>
}

Your Example Website or App

https://github.com/solidjs/solid-router

Steps to Reproduce the Bug or Issue

None

Expected behavior

When has "persist" prop it should mount the component on first visit and not cleanup on navigate out

Screenshots or Videos

No response

Platform

all

Additional context

No response

Start by tracing how and mount and clean up elements, then compare that lifecycle with the PersistRoute example in the issue. Determine how a persist prop should behave across navigation, including first visit and later revisits, and add coverage for the expected lifecycle before considering the feature done.