Show feedback as user types in PasswordField

[emteknetnz]

Split from #11413

When use the CMS 6 default EntropyPasswordValidator, display a new UX component that shows the strength of the password being entered in realtime

POC

• https://www.youtube.com/watch?v=HAFfEhTzcBo
• NEW Give feedback of password strength #11417
• NEW Give feedback of password strength silverstripe-admin#1832

Acceptance criteria

• A new UX component is created that provides feedback about password strength to the user as they enter their password

[GuySartorelli]

Copied from #11413 (comment)

Overall what you've shown in the video looks neat. Won't make sense when a different validation callback is passed into ConfirmedPasswordField or when a different password validator is applied to Member.