Python: Add support for Azure AI Agent Service

[moonbox3]

Motivation and Context

Azure AI Agents are a managed offering, and are built on top of the OpenAI assistant v2 APIs. Until now we have not had support for them in SK Python. This PR adds support for Azure AI Agents in SK Python. The current abstractions allow one to run managed Azure AI Agents using SK constructs as is demonstrated via the getting started samples and/or the azure_ai_agent concept code samples. The developer must first follow the required Azure AI Agent deployment steps, and bring their connection string as well as their model deployment name.

Description

Add support for Azure AI Agent Service in SK

• Add sample code
• Add unit tests
• Restructures the getting_started_with_agents samples to move the respective agent code into folders like chat_completion, azure_ai_agent, etc. Updates the README as well.
• Closes Python: Support an Agent based on Azure AI Agents #10187

TODO: add more test coverage either in this PR, or a subsequent one.

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
agent_content_generation.py	145	20	86%	68–71, 89, 91, 286, 338–366
agent_thread_actions.py	337	127	62%	139, 141, 176–179, 364, 366, 405–406, 432, 435–439, 442–454, 457–488, 494–501, 504–517, 533–563, 607, 636–670, 733, 738–743, 763–770, 801–810, 853–863
azure_ai_agent.py	79	9	89%	86, 88, 94, 103–108, 110, 153, 213
azure_ai_agent_utils.py	34	1	97%	44
azure_ai_channel.py	41	3	93%	93, 120–121
semantic_kernel/agents/channels
bedrock_agent_channel.py	80	44	45%	51–72, 91–112, 157–158, 169–186, 190–191, 200–212
chat_history_channel.py	79	2	97%	168, 171
TOTAL	18494	2175	88%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
3172	4 💤	0 ❌	0 🔥	1m 26s ⏱️

[TaoChenOSU]

I noticed when I worked on the Bedrock agents that there were not integration tests for all existing agents that we support. Could you create a work item for add integration tests for Azure AI agents if you do not plan to add integration tests right after this PR?

[TaoChenOSU]

LGTM. Will approve once the merge conflict is addressed.