Add examples from 3rd party crates

[LiamGallagher737]

Feature

It would be good to have examples from the available 3rd party crates in the examples search menu. For example, bevy_mod_picking is available in the playground so we would include its examples.

Solution

The best approach I can thing of ks just to copy/reuse the example loading for the main branch as most crates have version tags for their repo in the same way Bevy does.

These examples would then be added to the bottom of the list prepended by a <create-name>/.

[LiamGallagher737]

Use new api format, /api/<bevy-version>/examples in this case