Merge KernelConfig with Kernel

[mkarle]

Motivation and Context

KernelConfig isn't needed as it's less pythonic and is not used independently from Kernel. This moves all its methods and members into Kernel.

Description

• Removed KernelConfig
• Put KernelConfig's methods and variables into Kernel
• Ran unit and end-to-end tests
• Did not run notebooks because they are out of date with the current repo.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows SK Contribution Guidelines (https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
• The code follows the .NET coding conventions (https://learn.microsoft.com/dotnet/csharp/fundamentals/coding-style/coding-conventions) verified with dotnet format
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[awharrison-28]

Looks like there are conflicts to resolve in notebook 5, otherwise, LGTM

[nsteblay]

I'm far from a strong Python engineer but have been cloning this repo to learn about the Semantic Kernel. This change breaks all the Python notebooks. To continue my learning I need to reverse the changes that were made. I guess the notebooks aren't as "Pythonic" as they should be, whatever that means, but at least they worked. Given that this is code for introducing some of the basics I would highly recommend that the code work. This change provides no value at all, exactly the opposite.