chore(papyrus_base_layer): allow PriceSample to be serialized/deseria…

…lized

crates/papyrus_base_layer/src/lib.rs

@@ -75,7 +75,7 @@ pub trait BaseLayerContract {
 }
 
 /// A struct that holds together the data on the base layer's gas prices, for a given timestamp.
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Serialize, Deserialize)]
 pub struct PriceSample {
     pub timestamp: u64,
     // Fee is stored as u128 for compatibility with any base layer.