Pre-RFC: User namespaces on crates.io

[bascule]

@anon2808951

Or, simply do what Maven Central has done for the last 10 years.

Sonatype has a full-time staff which manually curates groupIds and promises a maximum turnaround time of two days when submitting new ones.

The reason for the delay is that a person must review the information submitted about all new projects. Many aspects of review and configuration have been automated, but there are some fundamental issues around namespace and the groupId assignment that prevent more extensive automation. For instance, no one wants fake org.apache or com.google components.Yet, at the same time, no one particularly wants domain registration to be a barrier to entry for OSS components.