Get functionality uptime chart

curl --request GET \
  --url https://api.rootly.com/v1/functionalities/{id}/uptime_chart \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "2025-12-20": 100,
    "2025-12-21": 100,
    "2025-12-22": 100,
    "2025-12-23": 100,
    "2025-12-24": 100,
    "2025-12-25": 100,
    "2025-12-26": 100,
    "2025-12-27": 100,
    "2025-12-28": 100,
    "2025-12-29": 100,
    "2025-12-30": 100,
    "2025-12-31": 100,
    "2026-01-01": 50,
    "2026-01-02": 0,
    "2026-01-03": 100,
    "2026-01-04": 100
  }
}