[Pre-RFC] DNS domains as package namespaces

Noratrieb:

I don't think it's good that people can just install the first library called tls that they see.

Note that this complaint is distinct to non-namespaced designs -- a namespaced design has package names like rusttls.dev/tls or joes-crab-shack-and-certificate-authority.xyz/tls, so the purpose of the library (implementing TLS) and any reputational assumptions about the author ("I trust Joe's Crab Shack, they have a great ChaCha20 implementation") are separate.