fix: ots_getContractCreater has field hash instead of tx

[jsvisa]

Motivation

the response of ots_getContractCreator from https://github.com/otterscan/otterscan/blob/develop/docs/custom-jsonrpc.md#ots_getcontractcreator as below:

object containing the following attributes, or null if the address does not contain a contract.
hash - The tx hash of the transaction who created the contract.
creator - The address who directly created the contract. Note that for simple transactions that directly deploy a contract this corresponds to the EOA in the from field of the transaction. For deployer contracts, i.e., the contract is created as a result of a method call, this corresponds to the address of the contract who created it.

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "hash": "0xe881c43cd88063e84a1d0283f41ee5348239b259c0d17a7e2e4552da3f4b2bc7",
    "creator": "0x6c9fc64a53c1b71fb3f9af64d1ae3a4931a5f4e9"
  }
}

Solution

PR Checklist

• Added Tests
• Added Documentation
• Breaking changes