Find an alternative for OpenSSL and git2-rs

[Angelmmiguel]

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

We want Wasm Workers Server not to rely on OpenSSL for several reasons (See #137). From the rustls / ring project, everything is ready. However, git2-rs uses OpenSSL under the hood and there's no plan to support rustls for now.

Describe the solution you'd like

We want to stop using OpenSSL. In a git2-rs thread, we found some alternatives like a Git pure rust implementation called gitoxide and replacing the current git2-rs transport with other that uses rustls.

We would need to research how to proceed before start with the implementation.

Describe alternatives you've considered

No response

Additional context

No response