libsignal-net-chat builds higher-level APIs on top of libsignal-net's
ChatConnection, while also abstracting for a future using a
non-WebSocket-message-based transport for these requests. It will
likely change a fair bit as more APIs get filled in, and existing
high-level APIs in libsignal-net may get moved here (specifically
keytrans and registration).
libsignal-cli-utils is a common place to put helpers for our example
binaries; it's not (at this time) meant for the bridge libraries we
ship as our main products.
