[TASK] Finish transactWrap/Unwrap flow with new token parameter on ExtData

[drewstone]

Issue summary
Still need to augment the extrinsic to support conditional wrap/unwrap when there is a valid token. We will use the largest T::AssetId to indicate NO unwrapping, i.e.:

• If token is T::AssetId::MAX() it means ONLY transact.
• If token is 0 it means native unwrapping.
• If token is non-zero it means non-native unwrapping.

[dutterbutter]

@drewstone is this completed?