Yes, Resident Evil Village does feature a lightsaber. It is unlockable in the Extra Content Shop at the end of the game. Here is how to unlock the LZ Answerer in the game.
How to unlock the LZ Answerer
To unlock the LZ Answerer in the Extra Content Shop, you'll need to Get SS or SSS rank in all 8 Mercenaries mode levels, which is no easy task.To get there, you'll have to spend time clearing the different maps of the mode to learn the waves patterns and maps of each area in order to optimize each run.