Get the unlocked package listed on AppExchange

[jongpie]

For a few years, I've been avoiding going through the process of putting Nebula Logger on AppExchange - but given how the project continues to grow in both popularity and functionality, I think it finally makes sense to (try to) get it published on AppExchange. For now, I'm only planning to publish the unlocked package - depending on how the process goes, I may eventually do the same with the managed package as well, but it'll be just the core unlocked package to start.