BE 2 - Implement User Authentication with Email + Password

[LeandroHamaguchi]

Use Supabase's documentation to implement user authentication logic for the app. Here are some resources:

• Our Supabase dashboard's documentation on authentication [Look over this!]
• Our Supabase dashboard's documentation on users management [Look over this!]
• Overview of authentication in Supabase
• Next.js template for authentication

Notes:

• We are using App router in Next.js
• If you need to install any dependency, write about it on your PR
• You don't need to implement the Login page. Ideally, this page would be done before this issue is assigned.

The goal is to:

• Be able to get a JSON object for a logged-in user and view the data from the user.

Include proof that the authentication works in your PR. A screenshot of the JSON object should be enough.