Get run usage statistics

curl --request GET \
  --url https://api.lunary.ai/v1/runs/usage

[
  {
    "date": "<string>",
    "name": "<string>",
    "type": "<string>",
    "completion_tokens": 123,
    "prompt_tokens": 123,
    "cost": 123,
    "errors": 123,
    "success": 123
  }
]