ConstRequest used to localize the captcha text
OptionalformKey: stringIdentifier for the form to look up configuration
Provide a random question captcha when the legacy flow is enabled.
OptionalformKey: stringIdentifier for the form requesting captcha data
Validate the answer for a simple question captcha.
Missing answers rely on required field validation and therefore do not emit additional flash messages here.
Retrieve the configured captcha metadata for a form, if present.