Update sidechain terminated cross chain command

[ishantiw]

Description

• Update schema

sidechainTerminatedCCMParamsSchema = {
    "type": "object",
    "required": ["chainID", "stateRoot"],
    "properties": {
        "chainID": {
            "dataType": "bytes",
            "length": CHAIN_ID_LENGTH,
            "fieldNumber": 1
        },
        "stateRoot": {
            "dataType": "bytes",
            "length": HASH_LENGTH,
            "fieldNumber": 2
        }
    }
}

• Update verification method

def verify(ccu: Transaction, ccm: CCM) -> None:
    if ccm.status != CCM_STATUS_CODE_OK:
        raise Exception("Sidechain terminated message must have status OK.")
    # This message should only be created on the mainchain.
    if ccm.sendingChainID != CHAIN_ID_MAINCHAIN:
        raise Exception("Sidechain terminated message must be sent from the mainchain.")

• Update execution method

def execute(ccu: Transaction, ccm: CCM) -> None:
    if isLive(ccm.params.chainID):
        createTerminatedStateAccount(ccm.params.chainID, ccm.params.stateRoot)

Acceptance Criteria

• Should have all the unit tests

Additional Information

• Related PR Update Interoperability LIPs lips#148
• Related LIP https://github.com/LiskHQ/lips/blob/main/proposals/lip-0045.md