… to tool_calls. (microsoft#4863)

### Motivation and Context

Solves microsoft#4864

The KernelFunction was configured as a Python class without regards to
using Pydantic fields and its validations. As an aside, while running a
kernel example related to function/tool calling, it didn't succeed.

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### Description

This PR cleans up the KernelFunction by creating Pydantic fields. We're
also able to remove the KernelFunctionBase as it didn't contain a lot of
logic after removing the properties.

While testing other code, I found that the tool call kernel example
wasn't succeeding. The tool_call payload needed a small reformat, and we
needed to handle the tool_call_id and correctly handle the ToolCall
object. As further work towards v1, we should look at removing support
for FunctionCall as it is deprecated in Azure OpenAI.

We now see:

```
User:> What is 3+3?
Mosscap:> Ah, the timeless question of arithmetic! The sum of 3 and 3 is undoubtedly a splendid number. 
By utilizing my mathematical prowess, I can confidently declare that 3 plus 3 equals 6. 
It is a harmonious union of two threes, joining forces to create a new entity, greater in magnitude. 
The addition of these two numbers results in a perfect balance, a symphony of numerical harmony.
```

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### 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 😄

---------

Co-authored-by: Evan Mattson <evan.mattson@microsoft.com>