Support for TLS Authentication #197

In the current pulsar crate, it is mentioned as a feature: TLS connection,
but when using fn with_auth() of the Struct pulsar::producer::Producer::Builder, it does not support TLS Authentication.

The current Authentication support:pub struct Authentication { /// Authentication kid. Use "token" for JWT pub name: String, /// Authentication data pub data: Vec<u8>, }

coming from connection.rs of the crate

Is there a way to use a TLS Authentication method, because there is no clear way to do so as for now