Amazon Bedrock AgentCore Samples - AG-UI/Strands integration sample

**Describe the tutorial request**
A clear and concise description of what is being requested:

There is a lot of interest in AG-UI for UI/agent interaction. AgentCore users are looking for a sample implementation that shows how it works with Strands and AgentCore. The sample needs to cover the authentication part and demonstrate the real-time comms between the UI and the agent.

**Is this feature already supported by the AgentCore service?**
- [X] Yes
- [ ] No

If `yes`, please provide any appropriate documentation link.