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For the final hop in a blinded route, the SCID and RelayInfo fields will _not_ be set. So these fields need to be converted to optional records. The existing BlindedRouteData constructor is also renamed to `NewNonFinalBlindedRouteData` in preparation for a `NewFinalBlindedRouteData` constructor which will be used to construct the blinded data for the final hop which will contain a much smaller set of data. The SCID and RelayInfo parameters of the constructor are left as non-pointers in order to force the caller to set them in the case that the constructor is called for non-final nodes. The other option would be to create a single constructor where all parameters are optional but I think this makes it easier for the caller to make a mistake.