feat: add email authentication in help menu and added LLM APIs

[dakshpokar]

Pull Request

Description

This PR introduces the integration of OpenAI, Gemini, and Claude as an LLM model option in the project. It updates various parts of the code to include Claude in the LLM model selection, allowing users to choose and configure models. The changes include UI updates for model selection, event handling for checkbox changes, and conditional visibility of input fields based on the selected models.

Related Issues

Changes Made

1. Enhancements to LLM Settings:
   Added support for additional LLM models (claude) alongside existing models (openai, gemini).
   Introduced LLMModels object to handle multiple LLMs with a default setting of { openai: true }.

2. Menu and UI Adjustments:
   Updated the menu to include checkboxes for selecting multiple LLM models, with a limit of two models.
   Modified various UI elements to handle new authentication keys for claude and email.

3. Event Handlers and Validation:
   Added event handlers for new checkboxes to show/hide corresponding authentication key inputs.
   Implemented a verification system for email authentication.

4. Initialization and State Management:
   Updated initialization logic to account for multiple selected LLM models.
   Adjusted state management to store authentication keys and preferences for the new LLM models.

5. API Integration:
   Integrated an email verification API call within the VerifyEmail function.

Screenshots (if applicable)

Checklist

• I have read the Contributor Guidelines.
• I have performed a self-review of my own code and ensured it follows the project's coding standards.
• I have tested the changes locally following ManualTestingProcess.md, and all tests related to this pull request pass.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation, if applicable.
• I have added appropriate unit tests, if applicable.

Additional Notes

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