Refactor frontend component registration

Try to reduce the number of [full component registrations](https://github.com/JetBrains/resharper-unity/blob/077be444a97f7328b5ae2a6754c24ad77dd862f7/rider/src/main/resources/META-INF/plugin.xml#L104-L120) - most only do something if it's a Unity project, and non-Unity users will still be paying the price. Note that even though there aren't a huge number of components, they also have dependencies, which might incur costs at being loaded.