Unlimit Anvil - no too expensive any more

You should get the Protocollib https://www.spigotmc.org/resources/protocollib.1997/ first (I use their dev build version，work fine on 1.20.1)
after 0.3.0, we don't need the Protocollib.

Only test on paper 1.20.1, if you encouter compatibility issues, let me know

config file:

# Generally no need to modify
version: "2"

# Whether to enable permission required
# permission： unlimitanvil.unlimit （op already has by default）
permission-require: false