Støtte for å binde "minCount" og "maxCount" i RepeatingGroup til datamodell

### Description

Jeg ønsker støtte for å kunne binde feltene "minCount" og "maxCount" til en RepeatingGroup til et felt i datamodellen, i stedet for bare en hardkodet integer.

I mitt tilfelle har jeg en repeterende gruppe hvor det er et krav at brukeren må legge inn et gitt antall items, men `minCount` varierer fra instans til instans.

Forlsag:

```json
{
"id": "my-repeating-group",
"type": "RepeatingGroup",
"dataModelBindings": {
"group": "some.list.in.datamodel"
},
"children": [
"child-component1",
"child-component2",
"child-component3"
]
"minCount": ["dataModel", "some.field.in.datamodel"],
"maxCount": ["dataModel", "some.other.field.in.datamodel"],
}
```

### Additional Information

- #2069

Start by tracing the RepeatingGroup implementation and its existing dataModelBindings behavior, then review the related discussion in #2069. Done means minCount and maxCount can use data-model values while preserving the current integer behavior and enforcing the requested item-count limits.

Written by the indexing model from the issue text.