Expose the link properties received when the link is attached

[richardpark-msft]

When a link is attached the service will reply with an Attach frame, with Properties. In Azure Service Bus, when creating links on a session-enabled entity, we get back a property value that tells us how long it's locked until.

This doesn't appear to be exposed in the current interface. I'd imagine it'd be similar to what we've already done for LinkSourceFilterValue, except we'd return the entire Properties map.

(this is the wireshark trace showing the returned attach frame)