Observations are not sorted

[ridoo]

GETting observations from a datastream responds with an unsorted list of obserations. How is sorting solved or could be enforced in connecting-systems? (I think one could not always rely on resultTime, right?)

GET /datastreams/a0288287-b14d-30f5-901f-fb65fc9f9bc6/observations?f=application%2Fjson

```json
{
  "items": [
    {
      "id": "fa60ff6a-4b6a-4c83-96d4-4490aa40207c",
      "datastream@id": "a0288287-b14d-30f5-901f-fb65fc9f9bc6",
      "resultTime": "2024-10-02T14:30:00+00:00",
      "result": 10.4
    },
    {
      "id": "212c3fc5-8167-4c45-9c81-b165ae0d9720",
      "datastream@id": "a0288287-b14d-30f5-901f-fb65fc9f9bc6",
      "resultTime": "2024-10-02T16:40:00+00:00",
      "result": 10.4
    },
    {
      "id": "99e58d21-78bc-4d10-a4c2-16a92a49748e",
      "datastream@id": "a0288287-b14d-30f5-901f-fb65fc9f9bc6",
      "resultTime": "2024-09-29T14:30:00+00:00",
      "result": 10.9
    },
    {
      "id": "ea0c98ed-ca9e-4a7b-b0aa-2112b5979ed5",
      "datastream@id": "a0288287-b14d-30f5-901f-fb65fc9f9bc6",
      "resultTime": "2024-09-29T22:20:00+00:00",
      "result": 11
    }
}

BTW: Within links, including UUID-ID in path and query parameter is redundant. I'd prefer it in the URL path instead of the query parameter -- are there cases where query parameter is preferred?

"links": [
  {
    "title": "next",
    "rel": "next",
    "href": "https://<base_url>/datastreams/a0288287-b14d-30f5-901f-fb65fc9f9bc6/observations?f=application%2Fjson&limit=10&offset=20&datastream=a0288287-b14d-30f5-901f-fb65fc9f9bc6"
  }
]