Async Rest client changes.

[nupur-khare]

Summary by CodeRabbit

• New Features

  • Enhanced chat functionality with asynchronous messaging support for WhatsApp and Microsoft Teams integrations.

• Improvements

  • Optimized message broadcasting to be asynchronous, improving efficiency and performance.
  • Upgraded session handling in WhatsApp integrations for better stability and resource management.

• Bug Fixes

  • Fixed issues with payload handling to ensure correct request body types are used in action executions.

• Tests

  • Updated integration and unit tests to support asynchronous operations and new functionality.

• Refactor

  • Transitioned to AioRestClient for asynchronous HTTP requests across various modules.

• Chores

  • General codebase cleanup and removal of deprecated synchronous HTTP request methods.