feat(native): doc loader for common native (#9941)

packages/common/native/fixtures/sample.rs

@@ -0,0 +1,10 @@
+fn factorial(n: u64) -> u64 {
+  if n == 0 {
+    return 1;
+  }
+  n * factorial(n - 1)
+}
+
+fn main() {
+  println!("Hello, world!");
+}