Create a traffic rule

curl --request POST \
  --url https://api.planetscale.com/v1/organizations/{organization}/databases/{database}/branches/{branch}/traffic/budgets/{budget_id}/rules \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "kind": "match",
  "keyspace": "<string>",
  "fingerprint": "<string>",
  "tags": [
    "<string>"
  ]
}
'

{
  "id": "<string>",
  "kind": "match",
  "tags": [
    {
      "key_id": "<string>",
      "key": "<string>",
      "value": "<string>",
      "source": "sql"
    }
  ],
  "actor": {
    "id": "<string>",
    "display_name": "<string>",
    "avatar_url": "<string>"
  },
  "syntax_highlighted_sql": "<string>",
  "created_at": "<string>",
  "updated_at": "<string>",
  "fingerprint": "<string>",
  "keyspace": "<string>"
}