Return new bbox inside the response of the recal-bbox endpoint

[giohappy]

The recal-c-bbox endpoint allows recalculating the bbox for datasets.
The bbox should return the updated bbox so that the client can update the view to the new extent.

The new extent will be returned within an extent property, the same as when returned for a resource.

"extent": {
  "coords": [
    33.89958237900004,
    -4.70227050799997,
    41.90154983900004,
    5.501040000000046
  ],
  "srid": "EPSG:4326"
}