Consider cosmicconfig #900
Description
Cosmic config was mentioned within #897 as an alternative approach to patternlab-config.json. I've experienced the flexibility adopting a tool like cosmic provides to users.
I also am excited because they support custom matches, so if we do it right we can make this a non-breaking change, but support all the formats specified in cosmic's docs. This work is likely a bit of plumbing across the CLI, Core, Editions, Plugins, really the entire ecosystem, and therefore is likely a big EPIC. One challenge is that some processes write back to the config, so doing that against many different targets is an interesting problem.