create ssz cli

[wemeetagain]

create cli for serialize, deserialize, hash-tree-root

[dapplion]

With a steep decline of priority over time, should this be implemented? If so, it this mono-repo the right place or should it be a separate project?

[wemeetagain]

its not particularly important, tend towards leaving unimplemented unless we have some extra time.
I was thinking we might eventually have a second cli tool for lower level / utility functions.
eg: lodestar for running the beacon chain/validator, and lodecli (or some other name) for eth2 swiss army knife functionality.