feat: Add CI/CD workflows for testing and publishing SAL crates

- Add a workflow for testing the publishing setup
- Add a workflow for publishing SAL crates to crates.io
- Improve crate metadata and version management
- Add optional dependencies for modularity
- Improve documentation for publishing and usage

os/tests/fs_tests.rs

@@ -165,9 +165,18 @@ fn test_mv() {
 
 #[test]
 fn test_which() {
-    // Test with a command that should exist on most systems
-    let result = fs::which("ls");
-    assert!(!result.is_empty());
+    // Test with a command that should exist on all systems
+    #[cfg(target_os = "windows")]
+    let existing_cmd = "cmd";
+    #[cfg(not(target_os = "windows"))]
+    let existing_cmd = "ls";
+
+    let result = fs::which(existing_cmd);
+    assert!(
+        !result.is_empty(),
+        "Command '{}' should exist",
+        existing_cmd
+    );
 
     // Test with a command that shouldn't exist
     let result = fs::which("nonexistentcommand12345");