[bug/feature request] default codec for collections

[SGStino]

Currently, collection interfaces like IReadOnlyList<T> can be serialized if the actual implementation is List<T>, T[], ...

But this will break the serialization:

IReadOnlyList<T> data = [element]; 

Frequently encountered when trying something like this in a unit test:

await grainProxy.MyMethodWithListParameter([1,2,3])

while these would serialize perfectly:

await grainProxy.MyMethodWithListParameter(new int[] {1,2,3}),
await grainProxy.MyMethodWithListParameter(new List<int> {1,2,3}) 

If I'm interpreting the type name in the exception correctly:

Orleans.Serialization.CodecNotFoundException : Could not find a copier for type <>z__ReadOnlySingleElementList`1[ItemType].

I'd assume that Roslyn generates a type for the initializer that implements the IReadOnlyList, but not with a known dotnet library type.

Which means Orleans won't ever be able to generate a serializer for it unless there's a fallback for IReadOnlyList<T> (in this case)?

Can I attempt to write a fallback serializer (or surrogate) somewhere, and how do I get it registered if the <>z__ReadOnlySingleElementList1` can't be referenced?

[alexander-jesner-AP]

Also see #8934