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The Error.cause feature is present in SpiderMonkey 91, meaning we can provide better error logs if the cause property is present on an error object.

This requires changing gjs_log_exception_full() to be recursive. In the case of a thrown value that is an Object with a cause property, the function should print something like Caused by:\n and then log that exception. Note that the cause may not be an object, or the cause may be a circular reference, and these cases must be handled and tested.

Also consider replacing the code in gjs_throw() that drops a second exception, to instead append the first exception to the second exception as the cause.