Improve bootstrapping situation

[agoose77]

We can't import the bootstrapped Literary in the same namespace as the Literary development environment, because both resolve imports against literary.

The easiest solution here is to rename the source package name src/literary_source to the canonical name at build time. The challenge will be in doing this cleanly; it's more of a Hatch thing than something Literary needs to know about.

The above solution wouldn't work with any scripts that reference literary; they'd use the bootstrapping version. That's probably what we want.