Add style lints for system set naming convention

[alice-i-cecile]

I think that these should end in Set, but opinions may vary! We should have a way to automatically and consistently enforce this. Related to #47.

Raised by @Jondolf on Discord:

Our system set naming is very inconsistent, there's Foo, FooSet, FooSystem, FooSteps

[benfrankel]

Also other naming conventions. See bevyengine/bevy#14274 for a summary of naming conventions within Bevy itself at the time the issue was created. For example, components not ending with Component is a convention that could have a lint. EDIT: I see that specific case is #47 :)