* Upgrade Tonic to Tokio 1.0 Work in progress for updating Tonic to Tokio 1.0. Since tower has not been released to crates.io, a git dependency is taken instead. * Upgrade Tonic to Tokio 1.0 phase 2 * tonic: remove tower-* deps * Apply suggestions from code review Co-authored-by: Ed Marshall <[email protected]> Co-authored-by: Lucio Franco <[email protected]>