sendOtp function in GoTrueAdmin.ts

I think it would be very useful to have a function called sendOtp to send an OTP code to an email or phone number that is not registered in the project.

Particularly in my current development I need to be able to link an email or phone number to a user who has lost access to my platform. I cannot do this because the resend function only works if the email or phone number you are trying to send the code to is registered in the project.

It would help a lot of people, I'm sure I'm not the only one that this happens to.