nervous-system-agent: extract 'is_canister_stopped_error' from 'CallCanisters' #10
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'is_canister_stopped' is currently used by PocketIc and ic-agent implementations. However, the 'CallCanisters' trait requires implementing this function. As a result, some trait implementations have dummy implementation for this method which panics in runtime.
To avoid runtime panic, this method is extracted into a dedicated 'CallCanistersWithStoppedCanisterError' trait that inherits 'CallCanisters'. This trait is only implemented for PocketIc and ic-agent's. An attempt to use 'is_canister_stopped_error' for other implementation will cause compilation error instead of runtime panic.