.Net: Update the Chat Completion With Data

[markwallace-microsoft]

• [ ] Change implementation to use the Azure OpenAI rather than a custom client
• [ ] Fix the outstanding issues listed below

Chat completion "with data" issues:

• .Net: Unable to configure DataSource as much as a vanilla HTTP request to OpenAI · Issue #4787 · microsoft/semantic-kernel (github.com)
• .Net: KernelPlugin is not working AzureOpenAIChatCompletionWithDataConfig · Issue #6019 · microsoft/semantic-kernel (github.com)
• .Net: [BUG] When working with Semantic Kernel, while invoking ChatCompletion API, unable to specify data sources · Issue #6061 · microsoft/semantic-kernel (github.com)