Add `[ExcludeFromCodeCoverage]` and/or `[GeneratedCode]` attributes

[ricardoboss]

Hi! I found this package to be quite useful!

I'd like to cover my code and the generated class pops up as uncovered code.
The simplest solution might be to add a dummy test that just checks each property.

The cleaner solution is to add [ExcludeFromCodeCoverage] and/or [GeneratedCode] attributes to signal to the test runner that this code cannot be/should not be covered directly.