[context menu] Support detached trigger

# Feature request

## Summary

Menu component does have this feature

## Examples in other libraries

Looks like there is a little bug in types in ContextMenu:
export interface ContextMenuRootProps extends Omit

It doesn't omit "handle" prop, so it still exist in contextMenu documentation here: https://base-ui.com/react/components/context-menu#root, which feels like the feature is already there.

## Motivation

Just the same as in Menu component: In some comlex DOM layouts it's more easier to add "handle" attribute istead of refactor whole DOM structure to wrap some part into `Trigger` for context menu.
```

{My taken from DOM structure}

```