implement password strength meter.

[Andrew Dunkman (he/him)]

As specified in login-gov_styleguide_v1.9.3.sketch:

Unclear of the best implementation for this — if we should include JavaScript for this, or just the styles.

[Adam B]

I think there are a couple of issues with including the JavaScript for this component:

• The current component has a hard dependency on the zxcvbn npm package which is fine but...
• the current component also has a hard dependency both on an I18n library supplied to the front-end via Rails, and on translation yml files in the provider app.

[John Donmoyer]

currently implemented