fix: validator staking endpoint with more info, and correct docs.

[TarikGul]

This adds a field called validatorsToBeChilled in the response, it also the at field which was missing. I also corrected the docs, and cleaned up the code. validatorsToBeChilled has accounts that may be in the validators field and I made sure to have that in the docs.

Response

{
  "at": {
    "hash": "string",
    "height": "string"
  },
  "validators": [
    {
      "address": "string",
      "status": "string"
    }
  ],
  "validatorsToBeChilled": [
    {
      "address": "string",
      "status": "string"
    }
  ]
}

Thanks to @Ank4n for info and clarification on the Storage query calls.

[IkerAlus]

LGTM, I checked in detail the new doc and looks on point. Good work.

[Imod7]

LGTM!