Python: Refactor chat completion concept samples (#9822)

### Motivation and Context

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Our chat completion concept samples are not well organized and
over-complicated with prompts and different settings.

### Description

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This PR refactors the samples such that they only capture the essential
concepts to the chat completion services. This PR also adds sample usage
for all supported chat completion services in Semantic Kernel Python.

### Contribution Checklist

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- [x] The code builds clean without any errors or warnings
- [x] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [x] All unit tests pass, and I have added new tests where possible
- [x] I didn't break anyone 😄

python/samples/concepts/README.md

@@ -5,6 +5,7 @@ This section contains code snippets that demonstrate the usage of Semantic Kerne
 | Features | Description |
 | -------- | ----------- |
 | Agents | Creating and using [agents](../../semantic_kernel/agents/) in Semantic Kernel |
+| Audio | Using services that support audio-to-text and text-to-audio conversion |
 | AutoFunctionCalling | Using `Auto Function Calling` to allow function call capable models to invoke Kernel Functions automatically |
 | ChatCompletion | Using [`ChatCompletion`](https://github.com/microsoft/semantic-kernel/blob/main/python/semantic_kernel/connectors/ai/chat_completion_client_base.py) messaging capable service with models  |
 | ChatHistory | Using and serializing the [`ChatHistory`](https://github.com/microsoft/semantic-kernel/blob/main/python/semantic_kernel/contents/chat_history.py) |