[REQ] Add support for SecuritySchema mutualTLS

[nicdard]

Is your feature request related to a problem? Please describe.

The current specification version, 3.1, supports the mutualTLS see:

• https://spec.openapis.org/oas/v3.1.0#security-scheme-object
• https://learn.openapis.org/specification/security.html#mutual-tls

However the generator is not supporting this yet.

Describe the solution you'd like

I would like to have support for parsing the mutual TLS security scheme, so that generators could be enhanced to support it as well

Describe alternatives you've considered

Additional context