Prevent ZetaClient and ZetaCore to observe inbounds when gateway is not setup with right version

[lumtis]

Describe the Issue In some case a change in the interface and event format will make gateway version and node tightly coupled.

To prevent invalid parsing we should allow ZetaCore or ZetaClient to query the current version of the interface of the contract.

Considered Solution

• In gatewayEVM and gatewayZEVM
  • Add a InterfaceVersion pure function returning the version of the interface: will be 1 for v20 and 2 for v21
  • Only increment when the change of the gateway make interface not compatible anymore with the node binary (so version not tied to node release)
• This version is a constant in the node binary, if the fetched one from the gateway contract doesn't match observation is disabled
  • Parsing event make contract revert in ZetaCore
  • Parse event make observation in ZetaClient (so observed height would not increase)

[UniDrills]

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