Support ReadOnlyCollection<T>

[dotnetjunkie]

Simple Injector supports all kinds of collections, but does not natively understand ReadOnlyCollection<T>. As ReadOnlyCollection<T> only has one constructor, Simple Injector v4 is able to construct the type and will inject a supported IList<T>, but this makes the ReadOnlyCollection<T> Transient, which could easily cause lifestyle mismatches.

Besides supporting the concrete type Collection<T>, Simple Injector should be able to inject a singleton ReadOnlyCollection<T> as well.

[dotnetjunkie]

feature-762 branch created.