Get all staking txs (i.e msgs) from a delegator

Example response

[
  {
    "tx": {
      "fee": {
        "amount": [
          {
            "denom": "steak",
            "amount": "50"
          }
        ]
      },
      "signature": {
        "signature": "MEUCIQD02fsDPra8MtbRsyB1w7bqTM55Wu138zQbFcWx4+CFyAIge5WNPfKIuvzBZ69MyqHsqD8S1IwiEp+iUb6VSdtlpgY=",
        "pub_key": {
          "type": "tendermint/PubKeySecp256k1",
          "value": "Avz04VhtKJh8ACCVzlI8aTosGy0ikFXKIVHQ3jKMrosH"
        },
        "account_number": "0",
        "sequence": "0"
      }
    },
    "result": {
      "gas_wanted": "0",
      "gas_used": "0"
    }
  }
]