RPC: add data field to RpcError / eth_call error

[ScottyPoi]

Updates to satisfy hive rpc-spec tests.

Adds an optional data field to the type RpcError:

RpcError = {
  code: number
  message: string
  trace?: string
  data?: string
}

eth_call

per hive tests: eth_call/call-revert-abi-error and eth_call/call-revert-abi-panic

when eth_call reverts, it should return an error object:

{ code: 3,
data: <executionResult>,
message: <error message> }

This change to eth_call fixes these 2 failing hive tests:

 if (execResult.exceptionError !== undefined) {
      throw {
        code: 3,
        data: bytesToHex(execResult.returnValue),
        message: execResult.exceptionError.error,
      }
    }

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[holgerd77]

Nice, LGTM 🙏🙂