reflect-lint: Support Kotlin annotations with default retention

[PhilGlass]

The default retention for annotations written in Kotlin is RUNTIME, but dagger-reflect-lint currently flags any Kotlin annotation without an explicit @Retention(AnnotationRetention.RUNTIME) as an error.

[TWiStErRob]

Based on the kdoc you linked to me it looks like you still must put @Retention() so only annotation class X doesn't seem to have RUNTIME retention. However your claim is correct in the end, but the relevant doc here is AnnotationRetention.RUNTIME and the annotation design doc

[PhilGlass]

@TWiStErRob You're right, that's the wrong documentation link. It was late!

I found another issue with AnnotationRetention.BINARY support after running this check over our codebase - I've pushed another commit that fixes it.