Introduce interoperability modules

[shuse2]

LIP

• LIP-0043 Introduce chain registration mechanism
• LIP-0045 Introduce Interoperability module
• LIP-0049 Introduce cross-chain messages
• LIP-0053 Introduce cross-chain update mechanism
• LIP-0054 Introduce sidechain recovery mechanism

Motivation

Interoperability has the potential to solve the scaling issue of blockchains: Instead of deploying applications and their corresponding commands onto a single blockchain, these are implemented into separate blockchains which then communicate with each other using an interoperability protocol.

Tasks

Bootstrap Interoperability Module and supporting classes

• Create Base classes required for Interoperability Module  #7015
• Bootstrap mainchain interoperability module #7016
• Bootstrap sidechain interoperability module #7017
• Create base interoperability store #7018

LIP-0045 Introduce Interoperability module

• Implement terminateChainInternal for interoperability #7044
• Implement isLive function for interoperability  #7043
• Implement addToOutbox and appendToOutboxTree internal functions #7042
• Implement sendInternal method in interoperability store  #7040
• Implement appendToInboxTree function #7041
• Implement createTerminatedStateAccount internal function #7052
• Implement createTerminatedOutboxAccount function #7053

LIP-0049 Introduce cross-chain messages

• Bootstrap cross chain commands for mainchain/sidechain modules #7024
• Implement apply() function in InteroperabilityStore #7025
• Implement forward() function of InteroperabilityStore #7026
• Implement bounce() function of InteroperabilityStore #7027
• Implement CrossChainChannelTerminatedCommand #7028
• Implement CCRegistrationCMD cross chain command #7029
• Implement CrossChainSidechainTerminatedCMD cross chain command #7030

LIP-0043 Introduce chain registration mechanism

• Bootstrap mainchain/sidechain registration commands #7032
• Implement SidechainRegistrationCommand for mainchain interoperability module #7033
• Implement MainchainRegistrationCommand for sidechain interoperability module #7034

LIP-0053 Introduce cross-chain update mechanism

• Bootstrap CCU mainchain/sidechain commands #7037
• Implement CrossChainUpdateCommand for MainchainInteroperabilityModule #7038
• Implement CrossChainUpdateCommand for SidechainInteroperabilityModule #7039

LIP-0054 Introduce sidechain recovery mechanism

• Implement sidechain State Recovery Initialization Command execution #7036
• Implement sidechain State Recovery Initialization Command validation  #7035
• Implement mainchain Message Recovery Command execution #7023
• Implement mainchain Message Recovery Command verfication #7022
• Implement mainchain State Recovery Command execution #7021
• Implement mainchain State Recovery Command verification #7020