Python: Add Azure AI Agent AI Search Sample. Update memory sample with README.

[moonbox3]

Motivation and Context

To showcase other ways to interact with Azure AI Agents, we're adding a sample that leverages the Azure AI Search tool.

Description

Adds the Azure AI Agent with AI Search sample.

• Includes README and hopefully enough information to get started. Assumes the user is able to set up the hotels-sample-index with the proper data model fields (outlined in SK).
• Updates the memory samples with a README to help make the usage more clear
• Update the default termination strategy max iterations from 1 to 5.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[markwallace-microsoft]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
semantic_kernel/agents/azure_ai
azure_ai_agent.py	81	10	88%	88, 90, 96, 105–110, 112, 114, 157, 217
semantic_kernel/agents/group_chat
agent_group_chat.py	114	12	89%	73, 163, 213, 217–227
TOTAL	18533	2170	88%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
3174	4 💤	0 ❌	0 🔥	1m 36s ⏱️