Get route policy configuration.

Example response

{
  "result": {
    "isolation_groups": [
      "ethereum:SEED <-> arbitrum:SEED"
    ],
    "blacklist_pairs": [
      "bitcoin:BTC -> starknet:*",
      "*:USDC -> bitcoin:*"
    ],
    "whitelist_overrides": [
      "ethereum:USDC -> bitcoin:BTC"
    ]
  }
}