List funds

curl --request GET \
  --url https://mkk.celebi.me/api/funds

{
  "funds": [
    {
      "id": "<string>",
      "fund_code": "<string>",
      "document_count": 123,
      "period_count": 123,
      "line_item_count": 123,
      "first_period": "<string>",
      "last_period": "<string>",
      "fund_title": "<string>"
    }
  ]
}