[Feature] Compatibility with ViaBackwards bedrock-at-y-0 setting

[bobhenl]

Hello, most servers use this:

# Adds bedrock blocks at y=0 for sub 1.17 clients. This may allow for weird interactions due to sending fake blocks.
bedrock-at-y-0: true

in viabackwards to prevent players getting stuck in the air. But when using Tuff client, players can view the blocks below y=0. BUT only on Tuff client.

Therefore, it would be useful, if either one of these solutions is made:

1. For Tuff client players, hook into ViaBackwards API and do not show that bedrock at y 0 (but it will be shown for the rest of the users)
2. Make some alternative of this viabackwards setting in TuffXPlugin, so it makes that bedrock y 0 layer for other clients that are below that 1.17 and are not on the tuff client.