Implement CrossChainUpdateCommand for SidechainInteroperabilityModule

[ishantiw]

Description

For SidechainInteroperabilityModule,

• Implement verify(context: CommandVerifyContext): VerificationResult of CrossChainUpdateCMD as follows,

  • Liveness of Partner Chain, make sure to use sidechain isLive function
  • Liveness Requirement for the First CCU
  • Certificate and Validators Update Validity
  • InboxUpdate Validity

• Implement execute(context: CommandExecuteContext): void of CrossChainUpdateCMD as below,

• Follow sidechain CCU execution logic LIP0053:Sidechain CCU#execution

• Follow common processing logic as described LIP0053:Common Processing CCU

Acceptance Criteria

• Unit tests for all the code paths for verify()
• Unit tests for all the code paths for execute()