Feature request: Add numeric support to Vigenère cipher.

[DxBang]

Is your feature request related to a problem? Please describe.
Vigenère cipher can also go beyond A-Z and include 0-9 as well as seen here https://vigenerecipher.com/

Describe the solution you'd like
Having a dropdown with Alpha and Alpha + Numeric options could be nice.

Describe alternatives you've considered
A checkbox saying "Include Numeric"

Additional context
Thanks for being awesome!