csharp: Enable conversion of container Eina.Values

csharp: Enable conversion of container Eina.Values

Summary:
When creating a new Value with any IEnumerable of a supported type, the IEnumerable
will be copied into an Eina.Value of type EINA_VALUE_ARRAY_TYPE.

Similarly, `Unwrap()` on a Eina.Value container will create a new
System.Collections.List<T> and return it.

Depends on D9272

Reviewers: felipealmeida, vitor.sousa, segfaultxavi

Reviewed By: vitor.sousa

Subscribers: cedric, #reviewers, #committers

Tags: #efl, #expertise_solutions

Differential Revision: https://phab.enlightenment.org/D9273