Add sort_by query parameter to release API

[preaction]

In order to get the release data in a more useful form, we should add a sort_by and dir query parameters to the release APIs:

• /v3/release
• /v3/release/dist/:distname
• /v3/release/author/:authorname

The sort_by query parameter can have the following values:

• dist - Order by the distribution's name
• version - Order by distribution versions
• dist_released - Order by the distribution's release date

The dir query parameter can have the following values:

• asc - Sort the list in ascending order
• desc - Sort the list in descending order

This will then allow the data dashboard to order the releases better (cpan-testers/cpantesters-web#11).

[1nickt]

Suggest dir is ambiguous and would be better as sort_order.

[preaction]

I ended up adding a /v3/release/dist/:dist/:version API that solves this in a different way. Right now, sorting this data isn't a priority, so I'm closing this.