vendor build time debugging binaries

Summary:
vendoring:
1. measureme summarize
2. measureme crox
3. measureme flamegraph
4. cargo-llvm-lines

which are all used to debug Rust build times (see https://fasterthanli.me/articles/why-is-my-rust-build-so-slow)

vendoring them because otherwise you'd need to go through a whole `rustup` dance on devservers, which is a pain

Reviewed By: guswynn

Differential Revision: D70274479

fbshipit-source-id: 067354cf963c8442fdba6d50bc1600eeeebf8f24

Author: emersonford