Use magma cream and a cauldron to get lava

Currently there is no way to obtain lava without first having a source of it. An idea I had was that magma cream could be added to a cauldron and would add a level to the lava amount within the cauldron.

This would fit perfectly with how cauldrons are currently used with lava, where dripstone farms slowly fill the cauldrons up with lava. This would also add another use to magma cream which only has two minor uses at the moment--brewing fire resistance potions and crafting magma blocks.

It would work in a very similar manor as using water bottles to fill a cauldron, just right clicking the cauldron with the item adds a level to the liquid inside. If it is too easy to fill a lava cauldron up this way, then it could have a % chance of adding a level just like how the composter works.