Feat: Added Custom API endpoint to check for duplicate mail ids in the database

[shreyash3087]

Descripiton:

This PR adds Custom API endpoint to check if the mail id entered in the newsletter form exists in the database or not,if it doesnt exists then only add the email in Mongodb atlas database.

Video:

https://github.com/mdazfar2/HelpOps-Hub/assets/72603662/adda2c11-f0cc-4736-a238-8a21ee77d366

Additional Context:

N/A

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[shreyash3087]

@mdazfar2 kindly review

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Name	Status	Preview	Comments	Updated (UTC)
helpops-hub2	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 27, 2024 7:58am