Don't implicit load plugins

[xlc]

Add a method to load plugins and call it from the entrypoint. We don't want to load then on import the files to avoid impact of start time on other applications using chopsticks as a library.

[ermalkaleci]

I think we worry about this when this becomes a problem

[xlc]

it is a problem I have with supx. not a big one but extra logs are annoying

[ermalkaleci]

can't we just remove the logs?

[xlc]

Let's fix the problem, not the symptom