migrate crate-details, match_version, db:: and test-fakes to sqlx

[syphar]

Finding a working smaller piece to migrate became harder and harder, this is bigger than I hoped, but works.

This migrates some major parts to sqlx & async, also including parts used in our main web::rustdoc endpoints.

Namely:

• CrateDetails and match_version, and the remaining release-details / list endpoints
• db::add_package methods, db::file
• test::fakes is async internally with sync wrapper methods for old tests

For things I didn't want to migrate (yet) I had to sprinkle plenty of runtime.block_on around to make it work.

I think there is a nicer way to design the whole TestEnvironment / FakeRelease story, perhaps with having async versions of both classes, similar to AsyncStorage / Storage. I would leave fixing

Also includes the changes from #2324

[syphar]

@rust-lang/docs-rs-reviewers any chance for a review?

I know it's much code, but I would love to push this forward. After these async refactors I could then invest some time into making our web handlers much more readable / understandable.

[GuillaumeGomez]

I can try but my review won't be up to much as I don't much this part of the code.

[GuillaumeGomez]

Apart from the strange JSON files, this is just a crate change so nothing to note in particular from me.

[syphar]

Apart from the strange JSON files, this is just a crate change so nothing to note in particular from me.

It's a little more than a crate change, since many methods get converted from sync to async.

But generally yes ;)

[GuillaumeGomez]

Yes absolutely, but it didn't seems strange or anything. So please just add a readme file in the json folder so people like me will know what's going on in there and why it even exists in the first place. :)