Adding natural language mode based on openaI compatible API

[rezpe]

Add Natural Language Interface to CLI using OpenAI-compatible APIs

Description

This PR adds a new ask command to the Adobe AEP CLI that enables users to interact with the CLI using natural language. The command leverages OpenAI-compatible APIs to translate natural language requests into appropriate CLI commands, making the tool more accessible and user-friendly.

Key Implementation Details:

• Added optional OpenAI client integration with graceful fallback if not configured
• New do_ask() method that processes natural language inputs
• Dynamic command discovery system that automatically extracts all available CLI commands and their descriptions
• Helper methods _get_available_commands() and _translate_nl_to_command() for command translation
• Environment variable configuration for API endpoint, API key, and model selection
• Comprehensive documentation in docs/natural-language-cli.md

Example Usage:
prod> ask show me all schemas
prod> ask list all datasets and save them
prod> ask what audiences do we have?