feat: Added send email template endpoint

[theijhay]

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Description

Implemented the functionality to send email templates. This includes robust error handling, retry mechanisms, and detailed logging to ensure that failures in sending emails do not disrupt the user experience. Additionally, ensured that user data is securely saved even if the email sending process fails. Unit tests were added to cover both successful and failure scenarios related to sending email templates.

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Related Issue (Link to issue ticket)

Related issue

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Motivation and Context

This change is required to provide a reliable mechanism for sending email templates as part of the user interaction workflow. It solves the problem of potential data loss or user experience issues caused by failures in the email sending process. By adding retries and logging, the system becomes more resilient and easier to troubleshoot in case of errors.

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How Has This Been Tested?

The implementation was tested using a suite of unit tests that simulate both successful email sending and various failure scenarios (e.g., network issues, invalid email addresses). The tests ensured that errors are handled gracefully, retries are attempted as expected, and logs are generated for troubleshooting. All tests were run in a local development environment using mock services to simulate email sending.

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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.