[FEAT]: Waitlist API - BACKEND

Description

Create a backend API endpoint to receive and store user information submitted through the waitlist signup form on the website.

The endpoint should be accessible at /api/waitlist.
The endpoint should accept POST requests to receive user information.
Given a POST request with user data, the system should validate and sanitize the incoming data.
Validation rules should include:
- Email format validation.
- Required fields: email, name.
- The name should be a non-empty string.
Given valid user data, the system should securely store the information in the database.

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Upon successful signup, the system should send a confirmation email to the user.
Return a 429 Too Many Requests status with an appropriate error message if the rate limit is exceeded.
The system should handle errors gracefully and return appropriate status codes.

Request Body

{
  "email": "johndoe@gmail.com",
  "full_name": "John Doe"
}

Error Response

{
  "message": "Invalid email format",
  "status_code": 400,
  "error": "Bad Request"
}

To allow potential users to join a waitlist for our product/service by submitting their information through a form on the website.

A secure and efficient API endpoint that can receive user information, store it in the database and confirm the user's addition to the waitlist.

Test that the endpoint returns a 201 status code with a success message on valid submissions.
Test that invalid data triggers a 400 Bad Request response with an appropriate error message.
Test that a confirmation email is sent upon successful signup.
Test that the rate-limiting works correctly and returns the appropriate status code when exceeded.