Python: Implement AI request settings

[eavanvalkenburg]

Motivation and Context

This PR implements the new approach to AI Request settings as described here: https://github.com/microsoft/semantic-kernel/blob/main/docs/decisions/0008-support-generic-llm-request-settings.md and completes #3312

Description

Does this:

• Creates AI Request Settings with service_id (referring to the registered AI services in a kernel) and extension_data, a dict that can hold any number of settings
• has several methods:
  • from_ai_request_settings -> constructor to create a new request_settings object based on another, supports creating specific ai_request_settings from generic ones.
  • update_from_ai_request_settings -> updating the fields of a request setting from another ones.
  • prepare_settings_dict -> method that is used when actually creating the dict that get's passed to the handler of the AI service.
• Created subclasses like OpenAIChatRequestSettings which has all the required fields of a OpenAI Chat completion, same for OpenAIText, AzureChat, GooglePalm, HuggingFace, etc.
• added get_request_settings_class to ai_services to return the class used for the settings for that service.

The goal is that when running, this settings object get's updated and a single operations (called prepare_settings_dict) is used to return a dict that can be passed to the api call directly, thereby reducing the need for custom logic everywhere, this will also negate the need for things like complete_chat_with_functions_async and others. So also removed complete_chat_..._async methods from openai and azure openai.

It has also changed the prompt_template_config with the generic type for the AIRequestSettings or subclasses, and some other changes.

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 😄

[moonbox3]

What an awesome PR. Thank you for doing this. I love the direction we're heading and how much you're simplifying config related items.

[moonbox3]

Have we gone through all Kernel examples and updated them with these new settings? Does the example chat_gpt_api_function_calling need any update regarding the prompt template config.