New Mob: The squishling

The squishling is a tiny passive mob that spawns on Mushroom Islands and in a new cave biome: The mushroom caves. Since in both of that biomes, no hostile mobs can spawn, he is scared of hostile mobs. Sculk sensors can hear when he's scared and work as a hostile mob detector. He will also bonemeal nearby plants sometimes, but especially he likes to spread mushrooms and mycelium. To do that, he could eat grass and mycelium to create bonemeal he can then use. He should be around a half block tall and have a cuby shape. He should drop brown mushrooms.