extacted axis to separate module

Signed-off-by: Andrei Gherghescu <[email protected]>

Author: andrei-ng

plotly/src/layout/annotation.rs

@@ -288,9 +288,9 @@ impl Annotation {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
     use serde_json::{json, to_value};
 
+    use super::*;
     use crate::common::{Anchor, Font, Label};
 
     #[test]