STAC Temporal extent to account for from_dt/to_dt of a product's datasets

[pierocampa]

Not sure whether this has been discussed already, but imho the temporal extent of a product should keep into account not just the center_dt declared in each dataset, but also the "borders", just like pixels borders are usually taken into account when specifying the bbox of an image.

Hence the extent of a product should pick the from_dt of the earliest dataset and to_dt of the latest one (when specified) to define the temporal extent. For instance:

"extent": {
  "temporal": {
    "interval": [
      [
        "2009-01-01T11:00:00.000000+00:00",  <-- from_dt of first dataset
        "2022-02-14T12:00:00.000000+00:00"   <-- to_dt of last dataset
      ]
    ]
}