[FEATURE REQ] Merge ChatThreadProperties and ChatThreadItem (sync their properties)

[ErikAndreas]

Library name

Azure.Communication.Chat

Please describe the feature.

Keeping track of your own threads (doing internal filtering/rules for which threads to display when etc) means using the ChatThreadClient (per thread) as opposed to using ChatClient.GetChatThreads (returns all threads user is participant in?)

But having a ChatThreadClient means only having access to ChatThreadProperties whereas ChatClient.GetChatThreads returns list of ChatThreadItem(s) - these objects (ChatThreadProperties and ChatThreadItem) are very similar but e.g. LastMessageReceivedOn only exists as a property on the latter?

Could these two be merged into one and the same or at least have the same set of properties?

[github-actions]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @acsdevx-msft.