Reveal/obscure password in KtFieldPassword

[RueRivoli]

Is your feature request related to a problem? Please describe.
It would be great to have the functionality to reveal the password in a KtFieldPassword.
With that, the user can check the value.

Describe the solution you'd like
In the new authentication pages, we have 2 options:

• show fields "password", "confirm password"
• have one field "password" with an eye icon (for example) so that the user can check the value

Describe alternatives you've considered
/

Additional context
This would be helpful for the sign up and set password pages.