Investigate Java collection wrappers performance

[jpobst]

Investigate if any of the methods provided by our Java collection wrappers (JavaList, JavaDictionary, etc.) could be implemented more efficiently.

For example, JavaList implements ToArray () by calling java.util.List.get (int) for each item in the List, resulting in a lot of marshalling overhead.

Could we instead call java.util.List.toArray () to retrieve all of the items in one call?

Another possibility might be to add something like ToImmutableList () to efficiently move a copy of the list to C# that no longer needs to be kept in sync with Java?