Lazy path cache (#90)

* feat: path cache now evaluates lazily

* chore: remove redundant slab dependency

* chore: fill in missing contexts on some errors

* style: use `reserve` instead of `with_capacity` for allocating strings

* fix: fix cache clearing in `rename`, `remove_dir` and `remove_file`

* fix: fix `create_dir` implementation when some parent dirs already exist

* style: use `.iter().rev()` to reverse vector instead of `.reverse()`

crates/filesystem/Cargo.toml

@@ -48,6 +48,7 @@ iter-read = "1.0.1"
 async_io_stream = "0.3.3"
 
 qp-trie.workspace = true
+slab.workspace = true
 
 [target.'cfg(windows)'.dependencies]
 winreg = "0.51.0"
@@ -58,7 +59,6 @@ async-fs = "2.1.0"
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 once_cell.workspace = true
-slab.workspace = true
 
 luminol-web = { version = "0.4.0", path = "../web/" }