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refactor: move some c code to go
As mentioned in #3951 , we want to move c code to golang, there are many hard works to do.
This PR has done the first step, move all the stage-1 c code and some of the stage-2 c code to go code, because they are not related to namespaces, they should be implemented by golang.
This refactor brings one benifit, it reduces one process clone when start/run/create a container. But because the stage-1 c code is hard to move to go code, so it brings a Complexity for libct/nsenter, for example, it's hard to write unit tests for nsenter.
Welcome more suggestions.