Stars sorting

[cookie1170]

Why

Being able to see star counts on assets, as well as assets with more stars being shown first makes it easier to find quality assets, especially as the number of assets grows.

What

This PR adds support for fetching stars on GitHub and GitLab for assets in bevy-assets, as well as changing the sort to take stars into account.
The new sort order is:

• Assets with a manually assigned order in bevy-assets
• Assets that are semver compatible with bevy, sorted by stars
• Assets that aren't semver compatible, sorted by stars

How

For each asset, the algorithm looks at its link:

• If it's a link to GitHub or GitLab, then fetch the star info from there
• If it's a link to crates.io, or it has a crate and the previous fetch failed; look at its repository field

Example

Here is the 2D section of assets before the change:

And after:

[cart]

Just dumping some context I found here (doesn't need to be done in this PR unless you really want to). Codeberg API requires no authentication:

GET https://codeberg.org/api/v1/repos/guix/guix. Stars are under the stars_count json field in the response.

Docs: https://codeberg.org/api/swagger#/repository/repoGet