Remove De-normalization Of Name and Version

[dstufft]

When we were using natural primary keys, a lot of tables had name and version keys on them, since that was how the FKs worked. With the move to surrogate keys for all of our primary keys, these existing name and version fields are just leftover bits of denormalization that needs to be handled.

In #4958 (comment) I laid out a few options for solving this. This PR represents choice (3).

There may be performance implications here, I've tried to keep any index that still seemed like it made sense, but this is sort of drastically altering the performance characteristics of some of these queries, so it's possible that there will be a performance regression. However, if there is we can, at that time, either solve it with additional indexes or perhaps choose to denormalize our data then.

[ewdurbin]

I think the only concern here is changing the name of a project per #4781 would destroy the original name for a given release.

[dstufft]

I'm not sure what you mean by destroy the original name for the given release?

[ewdurbin]

If a release for a project Pip==0.8.0 comes through and later the author chooses to rename to pip==1.0.0 utilizing the feature proposed in #4781 , Project.name would transition from Pip to pip and thus Release.project.name for Pip==0.8.0 would simultaneously transition from Pip to pip. I don't know if that's a huge issue, or really care. Just wanted to flag.

[dstufft]

Ah I see what you mean.

I don't think that matters, as long as we don't allow renames that change the normalized name all tools should treat them equivalent anyways. The current state is that the name in the dist file and the name on the Release metadata aren't always going to line up, because Release.name uses whatever Project.name was at the time of registration. However people can make changes in their dist file, and as long as the name normalizes to the same, we'll look up the correct Project instance, and use Project.name from that, even if that differers from what is in the dist file.