Add Set support where Array is Already Supported

[orchetect]

Similar to Array, add native support for:

• Storing a Set containing atomic value types
• Storing a Set containing RawRepresentable types
• Storing a Set containing Codable types

The underlying storage would still use Array. Set itself would not be added as another atomic value type.

To afford collection ordering stability, offer the option to sort elements if the element conforms to Comparable.