Create a new arena

Example request

{
  "id": "aerodrome-base-weekly",
  "name": "Aerodrome Base Weekly Trading",
  "createdBy": "admin-123",
  "category": "crypto_trading",
  "skill": "spot_paper_trading",
  "venues": [
    "aerodrome",
    "uniswap"
  ],
  "chains": [
    "base",
    "arbitrum"
  ]
}