Code to-do: move acknowledgement logic to chat adapter

(Related to #2490)

Feature Request

In packages/component/src/hooks/internal/useAcknowledgedActivity.js, we have a TODO for moving this acknowledgement logic to chat adapter.

Currently, we assume no chat adapter supports activity acknowledgement. In the future, it may need to change when we support human-to-human conversation.

The current acknowledgement logic:

• Acknowledge all activities when the user explicitly scroll to bottom (from a non-bottom position)
  • In the future, we might be able to use IntersectionObserver to progressively acknowledge activities as the user scroll
• Acknowledge all activities when the user sent a message

There are 3 ways to send the acknowledgement signal:

1. Send IDs of activities which is acknowledged (seems too flexible which could make things complicated)
2. Send the ID of the last acknowledged activities, everything above that activity is also considered acknowledged

• This assumes the order of activities perceived by Web Chat is same as the chat adapter

1. Send a signal to acknowledge all activities

• This assumes the chat adapter know what activities it sent to Web Chat, in an synchronous manner

[feature-request]

Start with packages/component/src/hooks/internal/useAcknowledgedActivity.js and read the TODO alongside related issue #2490. Document how acknowledgement currently occurs on scrolling and message sending, then resolve which acknowledgement signal the chat adapter should support and define the adapter boundary before implementation.