Is your feature request related to a problem? Please describe.
I've seen more than one user use Iris and VulkanMod together and it results in a crash. There are currently no plans to support VulkanMod, so the messaging could be better.

Describe the solution you'd like
Add breaks vulkanmod to the fabric.mod.json

Describe alternatives you've considered
None

Additional context
https://github.com/IrisShaders/Iris/blob/1.20.1/src/main/resources/fabric.mod.json#L52

An example of one such user that installed Sodium, Iris and VulkanMod: https://www.reddit.com/r/fabricmc/comments/1994b4l/can_i_get_some_quick_help/
I've mentioned in the CaffeineMC server that it'd be great to have this in Sodium too