Added LLMSecret data object and created API to list LLM models

Walkthrough

The recent changes enhance the bot framework's support for Large Language Models (LLMs) by introducing a new management system for LLM secrets. Key updates include the addition of the LLMSecret class, improved validation mechanisms, and streamlined APIs for retrieving and managing LLM configurations. These modifications aim to increase flexibility, robustness, and integration capabilities, allowing for better handling of diverse LLMs and their secrets.

Changes

Files	Change Summary
`kairon/actions/definitions/bot_response.py`, `kairon/shared/actions/utils.py`	Added `DEFAULT_LLM` parameter for flexibility in response generation and rephrasing.
`kairon/actions/definitions/prompt.py`, `kairon/api/app/routers/bot/action.py`	Introduced validations for LLM model existence before predictions, enhancing robustness.
`kairon/api/app/routers/bot/bot.py`, `kairon/api/models.py`	Added new API endpoint for listing provider models and updated `PromptActionConfigRequest` to include `bot` field for validation.
`kairon/importer/validator/file_validator.py`, `kairon/shared/admin/processor.py`	Updated validation methods to accept `bot` parameter for context-specific checks and introduced new methods for LLM secret management.
`kairon/shared/admin/data_objects.py`	Introduced `LLMSecret` class for managing LLM-related secrets with enhanced validation.
`tests/integration_test/action_service_test.py`, `tests/unit_test/admin/admin_processor_test.py`	Refactored tests to use `LLMSecret`, ensuring comprehensive coverage of new functionalities.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant API
    participant LLMSecret
    participant Sysadmin
    participant BotResponse

    User->>API: Request LLM model list
    API->>LLMSecret: Fetch model details
    LLMSecret->>Sysadmin: Retrieve LLM secrets
    Sysadmin-->>LLMSecret: Return secrets
    LLMSecret-->>API: Respond with model list
    API-->>User: Return list of available models

🐇✨ In the meadow bright and fair,
A bot’s secrets fill the air.
With LLMs dancing, oh what glee!
New paths for wisdom, wild and free.
Let’s hop along, our joy to share,
In fields of code, we craft with care! 🐇✨

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digiteinfotech / kairon