[FIX] [ANCHOR: BE PYTHON] Create a different endpoint to handle change of emails for users.

[hestherrh]

Description

Due to security reasons, users should undergo a special and well scrutinized process before they can be able to change the email linked to their accounts.

Acceptance Criteria

Require a verification process:
Implement a multi-step verification process that involves sending a verification email or code to the new email address. This helps ensure that the user has control over the new address and prevents unauthorized changes.

Limit the number of changes:
Allow users to change their email addresses only a limited number of times within a specific timeframe. This can help prevent abuse and maintain data integrity.

Expected Outcome

Users should be able to change their emails after going through the proper vetted process.