Python: Allow Kernel Functions from Prompt for image and audio content

[eavanvalkenburg]

Motivation and Context

I noticed that even though the input and prompt rendering match what you want to use for image and audio generation, we didn't support that.

This introduces just that, with two samples. This unlocks the following scenario's:

• Running text to speech pipelines with set intro/outro statements
• Creating function calls for image generation with limited scope and a lot of set pieces.

Description

• Adds a get_image_content method to the TextToImageClientBase class
• Adds the option to select a TextToImage or TextToAudio client in the service selector (only for non-streaming)
• Adds branches in the KernelFunctionFromPrompt _invoke_internal for those types.
• Adds handling the output as a FunctionResult
• Adds samples for both

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 Unit Test Overview

Tests	Skipped	Failures	Errors	Time
3418	5 💤	0 ❌	0 🔥	1m 43s ⏱️