Bridge relayer backwards compatibility for reading storage InboundLaneData/OutboundLaneData

[bkontur]

For permissionless lanes, we add lane_state to the InboundLaneData and OutboundLaneData structs. However, for a period of time (until both BHK and BHP are upgraded to the same version), we need the relayer to function with runtimes where one has been migrated with lane_state and the other has not. This PR addresses the incompatibility by introducing wrapper structs for decoding without lane_state.

[acatangiu]

please open an issue to remove this once we fully migrate, I want us to shed unnecessary complexity