Add rs-notify implementation of fs::watch (#9040)

This PR simplifies the Zed file system abstraction and implements
`Fs::watch` for linux and windows.

TODO:
- [x] Figure out why this fails to initialize the file watchers when we
have to initialize the config directory paths, but succeeds on
subsequent runs.
- [x] Fix macOS dependencies on old fsevents::Event crate

Release Notes:

- N/A

tooling/xtask/src/main.rs

@@ -47,10 +47,7 @@ fn run_clippy(args: ClippyArgs) -> Result<()> {
         clippy_command.arg("--workspace");
     }
 
-    clippy_command
-        .arg("--release")
-        .arg("--all-targets")
-        .arg("--all-features");
+    clippy_command.arg("--release").arg("--all-features");
 
     if args.fix {
         clippy_command.arg("--fix");
@@ -60,6 +57,7 @@ fn run_clippy(args: ClippyArgs) -> Result<()> {
 
     // Deny all warnings.
     // We don't do this yet on Windows, as it still has some warnings present.
+    // todo(windows)
     #[cfg(not(target_os = "windows"))]
     clippy_command.args(["--deny", "warnings"]);