Add gravestone-like feature for mobs by using the existing chrysalis

[Elenterius]

The goal of the PR would be to add a gravestone-like feature for mobs by utilizing the existing chrysalis block/item.

• [add a item that is crafted in the bio-forge
• when the item is applied to a mob it's consumed and a flag is set in the mobs persistent data
  (e.g. Entity#getPersistentData())
• on mob death check for the flag and store inside a chrysalis (with very low health) and place the chrysalis in the world at the death location

Note: The item texture can be a placeholder