feat(FluidTextInput): add password input functionality

[tw15egan]

Closes https://github.com/carbon-design-system/carbon/issues/12081

Adds in password functionality to FluidTextInput via the isPassword prop (open to other ideas).

Changelog

New

• isPassword prop added to FluidTextInput
• Additional styles to fluid-text-input.scss
• Additional tests for isPassword variant
• Additional stories / controls for password input

Changed

• Updated PasswordInput.js to accommodate fluid styles

Testing / Reviewing

Go to unstable_FluidTextInput and check out the Password Input story. Go to Playground story and enable the isPassword control, and verify the component works with invalid and warn styles.

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[tw15egan]

@aagonzales good catch, updated to fix that 👍🏻