fix: added email service to squeeze sign up

[SundayMba]

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Description

This pull request introduces email service functionality to the squeeze page. When a user signs up on the squeeze page, a confirmation email is automatically sent to their provided email address. This enhancement ensures better user engagement and confirmation of their subscription or sign-up.

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Related Issue (Link to issue ticket)

hngprojects/hng_boilerplate_nestjs#930 (comment)

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Motivation and Context

This change is required to enhance user experience by providing immediate feedback in the form of a confirmation email when they sign up. It helps ensure that the email provided is valid and gives the user a sense of completion after their sign-up action. This is crucial for maintaining user engagement and ensuring that only valid users are added to the database.

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How Has This Been Tested?

• Unit tests were created to ensure that the email service is triggered correctly when a user signs up.
• Manual testing was conducted in a development environment where the sign-up process was simulated, and the email delivery was verified.
• Postman was used to test the API endpoints to ensure that the email service integrates seamlessly with the rest of the application

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Screenshots (if appropriate - Postman, etc):

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
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Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.