Get a validator set a certain height

Example response

{
  "validators": [
    {
      "address": "iva1sltcyjm5k0edlg59t47lsyw8gtgc3nudrwey98",
      "pub_key": "icp1zcjduepqwhwqn4h5v6mqa7k3kmy7cjzchsx5ptsrqaulwrgfmghy3k9jtdzs6rdddm",
      "voting_power": "1000",
      "proposer_priority": "1000"
    }
  ]
}