(Java Parity) Make Bed Collision Box Fit Bed Shape

In Java, every part of a bed has their own collision boxes, including their legs, making it possible to stand on a bed that has another bed block 2 blocks above the bottommost bed when sneaking. In Bedrock Edition, the bed has a full cuboid collision box, not considering the empty space of the bed underneath it. 

Changing the bed collision box to match Java allows for more passage possibilities, including secret passages.