Plugin connection -> from unix sockets to port

[michelvocks]

Currently, Gaia uses unix sockets as communication channel for Gaia <-> Pipeline (Plugin) communication.

It has the following disadvantages:

• Gaia only runs on Unix (Mac/Linux) systems.
• Adding new SDKs is hard due to new/poor implementation and support of unix sockets.

It has the following advantages:

• It's secure. You can only hijack the communication when you have access to the filesystem.

We need to change to real port communication. It also means that we have to generate certificates for the communication between Gaia and the Plugin.

[michelvocks]

Following idea in my mind.
On every pipeline start, Gaia creates a new x509 certificate. It will set the path to the certificates as environment variables. This means every SDK needs to get the path from the environment variable and needs to configure mutual TLS.

What do you think @Skarlso ?