VanillaModelEncoder#emitItemQuads does not respect Forge/NeoForge model extensions

[PepperCode1]

NeoForge patches the ItemRenderer to respect IBakedModelExtension#getRenderPasses(ItemStack, boolean) and IBakedModelExtension#getRenderTypes(ItemStack, boolean): https://github.com/neoforged/NeoForge/blob/1.21.1/patches/net/minecraft/client/renderer/entity/ItemRenderer.java.patch#L26-L27.

Neither of these methods are ever called in either Forgified FRAPI or Forgified Indigo, which leads to severe issues like crashes and missing visuals. Calling them in VanillaModelEncoder#emitItemQuads would be the best solution, but would need additional work as FRAPI does not accept RenderTypes directly; this method would need to be moved to Forgified Indigo so it can provide the RenderTypes directly. Inspection of quads with a non-standard RenderType could result in BlendMode.DEFAULT.