feat: add support for socket listeners

What does this MR do?

This MR adds supports for spawning servers on unix sockets instead of TCP ports.

Socket listeners can be used for faster/safer communication between Pages and the reverse proxy exposed to the internet and it's a common/modern configuration to proxy external traffic to a local service.

TODO

• I added the Changelog trailer (e.g. Changelog: added) to the commits that need to be included in the changelog
• I added unit tests or they are not required
• I added acceptance tests or they are not required
• I added documentation (or it's not required)
• I followed code review guidelines
• I followed Go Style guidelines