Add option to enable TLS for communication with Trillian

[fghanmi]

Description Currently, the communication between Rekor and Trillian server does not support Transport Layer Security. This exposes the system to potential security risks such as data interception and man-in-the-middle attacks. To enhance the security and integrity of services communications, it is imperative to introduce an option to enable TLS - Rekor would ensure the verification of Trillian's certificates.

[bobcallaway]

I think this is complete now?