Use lazy import since right now zstandard is only used for tests and benchmarks and it's a testing dependency.
Use lazy import since right now zstandard is only used for tests and
benchmarks and it's a testing dependency.

nzlosh/st2,Plexxi/st2,Plexxi/st2,StackStorm/st2,StackStorm/st2,nzlosh/st2,Plexxi/st2,nzlosh/st2,nzlosh/st2,Plexxi/st2,StackStorm/st2,StackStorm/st2