Piglins in Embur bog / brimstone cavern should barter variant Nether bricks, if possible

[saltyseadoggo]

Is your feature request related to a problem? Please describe.

• BYG does not integrate any of its new Nether items into Piglin bartering. I feel like this is a missed opportunity.

Describe the solution you'd like
I don't know if this is really possible, but I think it could be neat if Piglins that are in the Embur bog or brimstone cavern biomes when they are bartered with should give blue or yellow Nether brick items, respectively, instead of the regular Nether brick items that are already a part of their bartering loot table.

Describe alternatives you've considered
I was originally going to suggest that Piglins should just have an equal chance of bartering each of the three Nether brick colours, but that would make the red kind less common overall. This idea would allow players who want to farm these bricks to deliberately find a Piglin in the correct biome to barter with, or move one there, and obtain only the colour of bricks that they are interested in.