Create index source

curl --request POST \
  --url https://example.com/api/indexes/{indexId}/sources \
  --header 'Content-Type: application/json' \
  --cookie better-auth.session_token= \
  --data '
{
  "sourceId": "<string>",
  "sourceType": "<unknown>",
  "streamName": "<string>"
}
'

{
  "enabled": true,
  "sourceId": "<string>",
  "sourceType": "<string>"
}