Add a PersistentDataType<ItemStack> or PersistentDataType<NativeNBTObject>

Is your feature request related to a problem?

My idea is to be able to save ItemStacks in PDCs, or any type of NBT object native to Minecraft, such as Entities, TileEntities, or other native Minecraft NBT objects that aren't huge (like a Chunk or a World).

The problem is, if we want to put an ItemStack in a PDC, we have to create our PersistentDataType, okay, but when we have to save the components, it's immediately hellish. We have to create a PersistentDataType for each component, while behind it, it's all NBTs.
The same goes for if we want to put an Entity in a PDC; saving all the important data for each entity type in a PersistentDataContainer quickly becomes unmanageable.

Describe the solution you'd like.

Add a PersistentDataType for Entity, ItemStack and TileState. This way we could do:

container.set(key, PersistentDataType.ITEMSTACK, item);
container.set(key, PersistentDataType.ENTITY, entity);
container.set(key, PersistentDataType.TILESTATE, tileState);

Describe alternatives you've considered.

Add an asPersistentDataContainer function for Entity, ItemStack and TileState, for the others I don't see any use, but why not for some. And this function would return a PersistentDataContainerView. In this way we could do:

container.set(key, PersistentDataType.TAG_CONTAINER, item.asPersistentDataContainer());

Other

No response

Start by reviewing the PersistentDataType and PersistentDataContainer API entry points and how ItemStack, Entity, and TileState data is currently represented. Done would require a decided, supported approach for storing the requested native Minecraft objects without requiring users to define component types themselves.