Some bevy_picking plugins do not have the Plugin suffix #16081
Description
Originally found with the bevy::plugin_not_ending_in_plugin lint.
There are 3 plugins introduced by bevy_picking that do not have a Plugin suffix:
MeshPickingBackendSpritePickingBackendDefaultPickingPlugins
1 and 2 should be renamed to follow the style of MeshPickingBackendPlugin or MeshPickingPlugin, while 3 should not even be a plugin, but instead a PluginGroup (like DefaultPlugins).
Given how all 3 of these types were added after 0.14 was released, their names are not yet public. (Excluding the release candidate.) This means that we still have a chance to rename them before they become introduced to other projects, avoiding breaking changes in the future.