Implement lost password retrieval for users

Implement lost password retrieval for users.

• Display of the password recovery form with email input field.
• Verify that email exists in the database and send a reset link to the user.
• The reset link will contain a token that is stored in the password_resets table and it will be invalidated after a complete password reset.
• Show password reset form when a valid link is visited and update the user password fields when the form is submitted.
• Add phpunit tests for password retrieval controllers.