Create or update an encounter

curl --request POST \
  --url https://api.wanderersguide.app/functions/v1/create-encounter \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "id": 123,
  "created_at": "2023-11-07T05:31:56Z",
  "user_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "icon": "<string>",
  "color": "<string>",
  "campaign_id": 123,
  "combatants": {
    "list": [
      {}
    ]
  },
  "meta_data": {
    "description": "<string>",
    "party_level": 123,
    "party_size": 123
  }
}
'

{
  "status": "success",
  "data": {
    "name": "<string>",
    "id": 123,
    "created_at": "2023-11-07T05:31:56Z",
    "user_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "icon": "<string>",
    "color": "<string>",
    "campaign_id": 123,
    "combatants": {
      "list": [
        {}
      ]
    },
    "meta_data": {
      "description": "<string>",
      "party_level": 123,
      "party_size": 123
    }
  }
}