refactor(tvix/store): Upgrade tokio-listener to get tonic support

Tonic support was added to tokio-listener upstream which removes the
need for use to have tonic compatibility wrapper types around it.

See: https://github.com/vi/tokio-listener/pull/2

Fixes b/311

Change-Id: I04a2dbb3bc3c8bfe9339583c0b46070c7ec97811
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9721
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>

tvix/store/src/lib.rs

@@ -1,7 +1,6 @@
 #[cfg(feature = "fs")]
 pub mod fs;
 
-pub mod listener;
 pub mod nar;
 pub mod pathinfoservice;
 pub mod proto;