Implement mainchain Message Recovery Command execution

[mitsuaki-u]

Description

Add message recovery command execution to mainchain interoperability module.

let trsSenderAddress be the address of the trs.senderPublicKey

# Set CCM status to recovered and assign fee to trs sender
updatedCCMs = []
for ccm in deserializedCCMs:
    
    for each module mdl for which beforeRecoverCCM exists:
        mdl.beforeRecoverCCM(trsSenderAddress, ccm)
        if the previous call fails:
            execution fails and trs is invalid
    ccm.status = CCM_STATUS_RECOVERED
    ccm.fee = 0
    push serialized(ccm) to updatedCCMs # CCM is serialized again

# Update sidechain outbox root
proof = { size: terminatedOutboxAccount(trs.params.chainID).outboxSize,
    idxs: trs.params.idxs,
    siblingHashes: trs.params.siblingHashes}

terminatedOutboxAccount(trs.params.chainID).outboxRoot = RMTCalculateRoot([SHA-256(ccmData) for CCMData in updatedCCMs], proof)

# Process recovery
for ccm in deserializedCCMs:
    swap ccm.sendingChainID and ccm.receivingChainID 

    # On sidechain, this case is always triggered and the message logic should be supported
    if ccm.receivingChainID == ownChainAccount.ID:
        if (ccm.moduleID, ccm.crossChainCommandID) is supported:
            call the logic associated with (ccm.moduleID, ccm.crossChainCommandID) on ccm
    elif ownChainAccount.ID == MAINCHAIN_ID:
        # Only send messages to active and live chains
        if (chainAccount(ccm.receivingChainID) exists
            and chainAccount(ccm.receivingChainID).status == CHAIN_ACTIVE 
            and isLive(ccm.receivingChainID):
            addToOutbox(ccm.receivingChainID, ccm)

Acceptance Criteria

• Add unit tests for message recovery