Sprint goals

• Introduce interoperability modules #6915
  • 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 terminateChain 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
    • Implmenent createTerminatedOutboxAccount function #7053
• Add example folder with mainchain-dpos setting #6755
• Update default ports #6361
• Fix block validation in consensus elements/chain framework #7056
• Update Validators & Dpos module to match LIP updates framework #7004
• Transaction verification and execution should be done in sequence framework #7057
• Missing static block header validation elements/chain #7058