Fix #4: Make Metal Forge mineable with a pickaxe

[twigtarsier]

Added metal forge to mineable/pickaxe.json to allow the block to be broken with a pickaxe.

[KnightMiner]

We use datagen for all our tags. You can't just create the Json file without updating the datagen or it will get automatically deleted next time datagen runs.

Look for the block tags provider java class. You will need to also include the updated cache file after datagen runs in this PR.

[twigtarsier]

Oops. I'm new to modding apologies for that oversight. Does this commit fix that?

[KnightMiner]

That looks good, though we should really set a mining tier. Given tin ore needs a stone tool, it makes sense to me that the forge would need a stone tool too.

If you look two lines below where you made your change, you can call my helper there to set pickaxe and the stone tool in one line.

[twigtarsier]

I just based it on the logic that you can mine a blast furnace with a wooden pickaxe even though it uses iron. But i will do it that way if you wish

[KnightMiner]

That is a fair point.