Use syscall type to delay the creation of syscall struct. #2155
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Pulling out changes from #2121
Included #2150 to disable musl test. Will rebase once #2150 is merged.
Details:
In this PR we propose to store a SyscallType instead of syscall structure. The syscall structure itself is am empty struct, so we can delay the creation. In this way, we don't have to pass this reference through the fork/clone boundary. The eventual goal is not to use lifetime reference in the
container_args
structure.