Prevent Brute force attacks - Support rate limiting for "Forgot password" and "verify account email" emails

[adrianboros]

Context

Currently you can resend email for forgotten password and verification email so It is possible to spam users' mailboxes by abusing the Forgot Password and Verify Account features. This can hurt our sender reputation, annoy users and flood the server with unnecessary traffic.

Todos

Implement a rate limiting feature where we could set a limit on how many password reset emails and verify account emails can be generated for a single email address in a given time frame.