[BUG] Mermaid Gem won't fill Cauldrons

[EndlessLeo]

Describe the bug
Mermaid gems cannot fill the vanilla cauldron.

To Reproduce
Place a vanilla cauldron, and right-click it with a mermaid gem in hand.

Expected behavior
Cauldron filled with water.

Minecraft version
1.20.1

Mod version
1.8.4

[EndlessLeo]

Since mermaid gems can be used as a bucket of water in fusion shrines, I think placing these gems in a cauldron should be reasonable.

[DaFuqs]

@f-raZ0R pls

I do not think cauldrons implement fluid api handling at all, actually. May be that we have to hardcode that one?

[DaFuqs]

Done!