Piston bases have tile entities when extending/retracting despite not needing them

When pistons extend or retract, their bases have tile entities, even though those are not needed. I was told that the extension progress is saved in a float, but this is not required, because there are a limited amount of ticks that an extension or retraction lasts (to my understanding at most three), so it could be saved in a block state. This would improve performance.

(split off of MC-159902)