createRequest
open fun createRequest(mContext: Context, @NonNull items: List<ItineraryItem>, useEmergencyExit: Boolean, @Nullable alertProviderSupplier: Supplier<MapUiApi.AlertProvider>): RouteRequest
Static route-build helper. Callers without an ItineraryImpl instance must pass the supplier of the active MapUiApi.AlertProvider explicitly (or null for no alert constraints); there is intentionally NO process-global provider state.