refactor(tvix/store): use composition in tvix_store crate

Change-Id: Ie6290b296baba2b987f1a61c9bb4c78549ac11f1
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11983
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: yuka <yuka@yuka.dev>
Tested-by: BuildkiteCI

tvix/glue/benches/eval.rs

@@ -34,7 +34,7 @@ fn interpret(code: &str) {
     let tvix_store_io = Rc::new(TvixStoreIO::new(
         blob_service,
         directory_service,
-        path_info_service.into(),
+        path_info_service,
         nar_calculation_service.into(),
         Arc::<DummyBuildService>::default(),
         TOKIO_RUNTIME.handle().clone(),