🎨 Introducing Conversations Helper | Reduce duplicated code

[Romanti-Ezer]

Summary

Upstreaming an improvement we did while working on a customer project. We needed the countOfOutstandingInvitesForConversation function in a new custom feature and it wouldn't be a good practice to just duplicate that code - I also saw this was being used in Park Interactions - , so we introduced the ConversationsHelper to centralize this and any other future utils related to Conversations.

We also copied the types to the ConversationState file so future features/utils can reference types from there. (We didn't completely move from conversations-transfer because it was too much trouble and there were conflicts with existing types in ConversationState)

I tested conversations-transfer locally to make sure things are still working as expected. Park interaction we cannot test locally so I couldn't check, but it should be fine.

https://github.com/twilio-professional-services/flex-project-template/assets/31014910/25d0fd28-5de5-4f8a-8859-ad82ccfd3d3b

Checklist

• [x] Tested changes end to end
• [x] Requested one or more reviewers