Fix linq casts

[manodasanW]

• Fixing scenario where IEnumerable is not supported by native object but generic IEnumerable is
• Making use of a helper type which knows the appropriate GetEnumerator to redirect to based on which child type implements IEnumerable
• Fixing issue where AdditionalData dictionary was initialized each time with a new one
• The results of GetInterfaceImplementation is cached and used for other objects. So instead of handling the logic to choose the right implementation there, implemented 2 helper types for the ones handled there and moved the logic to detect which type it is in the helper class itself which then redirects to the other types FromABIHelper.

Fixes #482

[Scottj1s]

thanks!

[manodasanW]

@jkoritzinsky , I am going to merge this PR to get in a build, but feel free to leave any comments if you see any issues and I will look at addressing them in another PR.