gRPC Firestore `Listen` in Rust

Obsessing on gRPC Firestore Listen somewhat but it&rsquo;s also a good learning opportunity for me to write stuff in Rust. This doesn&rsquo;t work against Google&rsquo;s public endpoint (possibly for the same reason that gRPCurl doesn&rsquo;t work either) but this does work against the Go server described in the other post. I&rsquo;m also documenting here because I always encounter challenges…