LP1977554 - Add Password visibility toggle on login screens

LP1977554 - Add Password visibility toggle on login screens

Changed the <span> tags to <button> tags so it can be reached via
keyboard navigation.

Added a few more attributes to the password input tag.
autocapitalize="none"
spellcheck="false"
aria-description so screen readers can describe to the user what
the current state is.

Added aria-checked to the button for screen readers

Added a new css file for the login.component with a little styling.

Signed-off-by: Scott Angel <scottangel@mobiusconsortium.org>