[BACK] Add e-mail sending and password reset request endpoint.

[ArielMAJ]

Type of feature

🍕 Feature

Current behavior

Currently, there is no way for an user to recover an account.

Suggested solution

• Add a e-mail sending service;
• Add a password request endpoint.
  • The endpoint should, upon providing an e-mail, send the user a code for reseting its password (if the account exists).
• Add a password reset endpoint.
  • The endpoitn should, upon providing valid e-mail and token, reset the user's password.

Additional context

No response