[Feat] Integrate with Email to Send Task Reminders

Is your feature request related to a problem? Please describe.
Currently, users are unable to receive reminders for their tasks via email. This can lead to missed deadlines or tasks that are forgotten. Integrating email support to send reminders will ensure that users are notified about upcoming tasks and deadlines, improving task management and overall productivity.

Describe the solution you'd like
Integrate an email notification system that sends reminders to users about their tasks based on their chosen reminder time.
Email Reminder Setup: Allow users to set a reminder time for each task (e.g., 1 hour before, 1 day before, etc.).
Email Template: Use a standardized email template to send task details such as task name, description, due date, and reminder time.
Email Service Integration: Integrate with an email service provider (e.g., SendGrid, SMTP) to send reminder emails.
User Preference: Provide users with an option to enable or disable email reminders for tasks.

Additional context
Please take care to not push sensitive info such as email/password in your PR. Add sensitive info to a file and dont push it in your PR. Please discuss with maintainers before you make a PR here.

No files, tests, or entry points are named. Before coding, discuss the email provider, reminder scheduling, templates, preferences, and secret handling with maintainers; completion should cover the requested reminder behavior and its verification.