Adding voicelive agent sample and sample updates

[goergenj]

Description

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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Testing Guidelines

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[github-actions]

Thank you for your contribution @goergenj! We will review the pull request and get back to you soon.

[Copilot]

Pull Request Overview

This PR updates the Azure AI VoiceLive sample code to align with updated SDK configurations and adds a new sample for Foundry agent integration. The changes primarily focus on updating default values for endpoints, models, and voices, along with adding support for agent-based voice assistants.

Key Changes

• Updated default endpoint from WebSocket format to HTTPS format
• Changed default model from gpt-4o-realtime-preview to gpt-realtime
• Updated default voice to Azure's Dragon HD neural voice
• Added new agent voice assistant sample with conversation logging
• Updated documentation and environment templates

Reviewed Changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
sdk/ai/azure-ai-voicelive/samples/utils.py	Reformatted file (whitespace only, no functional changes)
sdk/ai/azure-ai-voicelive/samples/basic_voice_assistant_async.py	Updated default endpoint to HTTPS format and default model/voice values
sdk/ai/azure-ai-voicelive/samples/async_function_calling_sample.py	Reformatted file (whitespace only, no functional changes)
sdk/ai/azure-ai-voicelive/samples/agent_voice_assistant_async.py	Added new sample demonstrating Foundry agent integration with conversation logging
sdk/ai/azure-ai-voicelive/samples/README.md	Updated dependencies, environment variables, and documentation for new samples
sdk/ai/azure-ai-voicelive/samples/BASIC_VOICE_ASSISTANT.md	Updated model names and added reference to agent sample
sdk/ai/azure-ai-voicelive/samples/.env_sample	Added new environment template file with updated defaults
sdk/ai/azure-ai-voicelive/.env.template	Updated with new defaults and agent-specific configuration

[goergenj]

@xitzhang Missed you by a second with the .md update to make the documentation consistent. Final now. Not touching it anymore unless asked for changes until merged.