Add fields for TLS material to destination config

[meln5674]

Adds optional fields tls_cert_file, tls_key_file, and tls_cafile to the configuration TOML to support connecting to TLS and mTLS podman API sockets.

This is in support of containers/podman#24601 to fix containers/podman#24583 .

[openshift-ci]

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[rhatdan]

If you are going to add more fields, you need to document them in the containers.conf file and the containers.conf.5.md file.