No notification on change password feature

Summary

A security researcher discovered that Legal Robot did not send notifications on important account changes, like password changes. While there was no specific security vulnerability, we decided to add notifications for Password Change, TOTP Enable/Disable, U2F Enable/Disable, Recovery Code Use, and Recovery Code Confirmation (recently reported in #250082).

i discovered that there is no notification at some account actiivity. after discussing with @danrubins , he comes with more point to notify user on many activity (U2F Enable/Disable Recovery Code Use etc. ) Thanks a lot legal robot team and @danrubins .