The Rust community opened an issue on their tracker [0] - it seems that they are not working on one right now:
> Greetings folks! I work on the team that builds the Cloud Client Libraries. Per the last comment - I can absolutely share that we're not actively working on a Rust SDK right now, and we have no immediate plans to start. We completely understand this would be useful, and we'd love to go build it. However, we're focusing all of our energies on Java, Go, Node.js, Python, C#, Ruby, PHP, and C++ at the moment. If you're looking to build something, I'd be happy to bounce ideas with you!