refactor(tvix/store): Asyncify PathInfoService and DirectoryService

We've decided to asyncify all of the services to reduce some of the
pains going back and for between sync<->async. The end goal will be for
all the tvix-store internals to be async and then expose a sync
interface for things like tvix eval io.

Change-Id: I97c71f8db1d05a38bd8f625df5087d565705d52d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9369
Autosubmit: Connor Brewster <cbrewster@hey.com>
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>

tvix/store/Cargo.toml

@@ -5,18 +5,20 @@ edition = "2021"
 
 [dependencies]
 anyhow = "1.0.68"
+async-stream = "0.3.5"
 blake3 = { version = "1.3.1", features = ["rayon", "std"] }
 clap = { version = "4.0", features = ["derive", "env"] }
 count-write = "0.1.0"
 data-encoding = "2.3.3"
 lazy_static = "1.4.0"
 nix-compat = { path = "../nix-compat" }
+parking_lot = "0.12.1"
 prost = "0.11.2"
 rayon = "1.6.1"
 sha2 = "0.10.6"
 sled = { version = "0.34.7", features = ["compression"] }
 thiserror = "1.0.38"
-tokio-stream = "0.1.14"
+tokio-stream = { version = "0.1.14", features = ["fs"] }
 tokio = { version = "1.28.0", features = ["fs", "net", "rt-multi-thread", "signal"] }
 tonic = "0.8.2"
 tracing = "0.1.37"
@@ -31,7 +33,6 @@ serde_json = "1.0"
 url = "2.4.0"
 pin-project-lite = "0.2.13"
 const-zero = "0.1.1"
-parking_lot = "0.12.1"
 
 [dependencies.fuse-backend-rs]
 optional = true