Create a new init command for initializing genAI configs

[santoshkal]

Create a new command to initialize Genval's AI's initial configurations:
The command would be executed as: genvai genai init

• Set the user LLM backend
• Set the API key for the selected LLM
• Set the local directory in users machine to store all the systemPrompts

[santoshkal]

The genai init command is completed with some updates.

• the LLM backend and its respective API key are not included in the init command. Whenever the init command executes and completes the process, the information like LLM backend and API key are discarded and not available when a new process/command is used subsequently.

As storing sensitive information like API keys locally or in the code base is not a recommended practice. The feature is currently removed from the genai init command and the same is read while interacting with the backend.