[API] Interleaved state override to EstimateGas

[hyunsooda]

Proposed changes

Overwrite state if the overrides fields is given in kaia_estimateGas and eth_estimateGas APIs.

Geth has updated the override.Apply() function, a new feature that modifies the precompiled contract address, but it is not imported in this PR. (also, this feature is not triggered against EstimateGas API)

Example usage:

#!/bin/bash

curl -X 'POST' \
  'http://localhost:8551' \
  -H 'accept: application/json' \
  -H 'Content-Type: application/json' \
  -d '{
  "method": "kaia_estimateGas",
  "id": 1,
  "jsonrpc": "2.0",
  "params": [
    {
      "from": "0x9a8d1dfdad4806605e3c63067897e4f13b06a5b4",
      "to": "0x10235AC9fCb213e1B229f636913637CD35Bf4031",
      "gas": "0x1cbf1",
      "value": "0x0",
      "gasPrice":"0x5d21dba00",
      "input": "0xe3dc878300000000000000000000000000000000000000000000000000000000000004d2"
    },
    "0x7bd",                                                                       # block number
    {                                                                                    # state override
      "0x9a8d1dfdad4806605e3c63067897e4f13b06a5b4": {
        "balance": "0xde0b6b3a7640000"
      }
    }
  ]
}'

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