Add support for RADIUS authentication

As an enterprise, we already have our own MFA service which support RADIUS authentication.

Bitwarden doesn’t support RADIUS or SAML. Adding RADIUS authentication as a second factor would allow enterprise to support more authentication than the currentl supported one. For instance, RSA securID.

Same here with FortiToken. RADIUS Auth for Bitwarden would very useful.

Feel free to ping if you want this feature request reopened.