[Feature] Support different TLS configurations for different target domain in Callbacks

[elianre]

Hello, Mockoon team,

First, thanks for providing such a wonderful tool. Here I want to propose a feature for Callbacks part. I'm using mTLS for my work. And different TLS client cert is needed for different target domain. So is that possible we can have the client configuration setup when we create callbacks?

Regards,
Ren