Python: Add kwargs to create_agent method

[dmytrostruk]

Motivation and Context

Resolves: #1571

1. Added **kwargs to create_agent() method on AzureAIProjectAgentProvider to pass additional parameters to PromptAgentDefinition when creating an agent.
2. Added sample demonstrating content filtering (RaiConfig) usage.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

[markwallace-microsoft]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
packages/azure-ai/agent_framework_azure_ai
_project_provider.py	93	13	86%	128–129, 207, 214, 282, 326, 359, 408–410, 414–416
TOTAL	17430	2669	84%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
3149	213 💤	0 ❌	0 🔥	1m 6s ⏱️

[Copilot]

Pull request overview

This PR adds flexibility to the create_agent() method by accepting arbitrary keyword arguments that are passed through to PromptAgentDefinition, enabling users to specify additional parameters like RAI (Responsible AI) policies for content filtering.

Changes:

• Added **kwargs parameter to AzureAIProjectAgentProvider.create_agent() method with corresponding documentation
• Added a new sample demonstrating content filtering using RaiConfig with Azure AI agents
• Updated the samples README to document the new content filtering example

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
python/packages/azure-ai/agent_framework_azure_ai/_project_provider.py	Added **kwargs parameter to create_agent() method and merges kwargs into the args dict passed to PromptAgentDefinition
python/samples/getting_started/agents/azure_ai/azure_ai_with_content_filtering.py	New sample demonstrating how to use RaiConfig for content filtering with Azure AI agents
python/samples/getting_started/agents/azure_ai/README.md	Added documentation entry for the new content filtering sample