feat: post user faq inquiries form

[JoshuaOloton]

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Description

This update handles the submission process for the additional inquiries form on the contact page and implements an email notification feature to provide feedback upon successful submission.

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Related Issue (Link to issue ticket)

hngprojects/hng_boilerplate_nestjs#878
#958
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Motivation and Context

This change is necessary to ensure that users receive confirmation when their inquiries are submitted through the contact page. The added email feedback functionality enhances user experience by providing immediate acknowledgment of their request, improving communication and user satisfaction.
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How Has This Been Tested?

Apprpriate unit tests have been carried out using the Pytest library
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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.