Make sure we support IList<T>, not just array/List<T>

[roji]

[sethzollinger]

@roji, I just noticed this issue and even though I do not know what it is about exactly, I think it is in a similar area as my suggestion #2577.
I understand however if this is completely out of scope. As a short summary:

Although allowing IList would already solve my biggest issue with: CA1002: Do not expose generic lists.
I am assuming the actually instantiated type would default to List. And could not be overriden / configured?

My request was (at least conceptually) about allowing any list-type, like ObservableCollection.
Or ImmutableList, which would require to loosen the required interface even further from IList to IReadOnlyList

Of course "npgsql" can not support instantiating any list-type and types not implementing new(), new(int capacity), ICollection.Add, etc. - like ImmutableList - require special instantiation anyway.
Preferably this could be configured through HasPostgresArrayConversion (with where TProperty : IReadOnlyList<TElementProperty>).
Although of course this is already possible with INpgsqlArrayConverter and is a good enough solution.

Thank you for your time.