Describe your changes

This PR adds the ability to send multiple callback updates in a single task from the frontend. This prevents race conditions where multiple trigger updates sent in the same macrotask could result in only the latest one being processed by the backend.

This is important for CCv2 because components can set multiple pieces of state in the same macrotask, such as:

setTriggerValue("foo", true);
setTriggerValue("bar", false);
setStateValue("baz", 123);

Key changes:

• Added batching mechanism for widget updates
• Implemented JSON payload aggregation for trigger widgets
• Aligned ChatInput behavior with the same batching mechanism
• Updated tests to use async/await with waitFor to properly test asynchronous widget updates

GitHub Issue Link (if applicable)

Testing Plan

• Unit Tests: Added comprehensive test suite for the new batched trigger functionality, including tests for:
  • Single trigger payloads
  • Multiple aggregated payloads
  • Coalescing JSON values with trigger values
  • Edge cases like parse failures and fragment ID handling
• A few existing tests were updated to use async/await pattern with waitFor to properly test the asynchronous widget update behavior

Contribution License Agreement

By submitting this pull request you agree that all contributions to this project are made under the Apache 2.0 license.