Dynamic expression function to determine if a component is hidden or visible

### Description

I would like a boolean dynamic expression [function](https://docs.altinn.studio/app/development/logic/expressions/) that evalutes whether a component is hidden or visible. This is useful in schema logic to evaluate if a component should be shown to the user or not, based on the visibility of other components.

Say I want to show an input-field, if, and only if, an earlier panel-component is shown, I would like something like this:

`ui/form/layouts/page1.json`

```json
{
"id": "mypanel",
"type": "Panel",
"variant": "info",
"showIcon": false,
"textResourceBindings": { },
"hidden": [ ...long expression to evaluate if this panel is shown or not, that I do not want to repeat in myinput...]
},
{
"id": "myinput",
"type": "Input",
"dataModelBindings": { },
"required": true,
"textResourceBindings": { },
"hidden": ["component-hidden", "mypanel"]
}
```

This function could also be used to check if `mypanel` is visible, i.e.:

* `[ "not", ["component-hidden", "mypanel"] ]`
* `[ "equals", ["component-hidden", "mypanel"], false ]`

### Additional Information

- Related: Altinn/altinn-studio#16764
- https://altinn.slack.com/archives/C02EJ9HKQA3/p1727704676459989

Start with the dynamic expression documentation linked in the issue and the example structure in ui/form/layouts/page1.json. Search the frontend for the existing component-hidden expression and visibility handling; done means the expression can determine whether a referenced component is hidden or visible and supports the shown schema-logic use case.

Written by the indexing model from the issue text.