Summary:
let's turn the wez's argparse library from telemetry into a separate
crate withing hg/lib. We'll experiment on it and if things go well we'll make
`telemetry` depend on that.
Reviewed By: quark-zju
Differential Revision: D7752615
fbshipit-source-id: 0814d91d704abdb746894a0289bf082e8d799b73
