Add voice as an enrollment method and authentication method

[alex-sh-wu]

Describe the problem you'd like to have solved

I would like the ability to get a voice based otp using my phone number only, similar to how SMS currently works.

Describe the ideal solution

• transaction.getAvailableEnrollmentMethods() includes voice in the array if it is enabled
• enrollment.getAvailableAuthenticatorTypes() returns voice in the array if it is enabled
• all of the functions that work with the sms enrollment/authentication method would also work the same if the voice was selected (e.g. transaction.enroll(data, callback) accepts a phoneNumber when voice is the chosen method)

Alternatives and current work-arounds

Use SMS. This would be the closest thing to voice since only a phone number is required.

Additional context

This would be helpful for users with accessibility issues to verify using an otp.