starknet_particia_storage: extend the storage trait to optionally flush to cache

Author: nimrod-starkware

crates/starknet_patricia_storage/src/map_storage.rs

@@ -330,6 +330,11 @@ impl<S: Storage> Storage for CachedStorage<S> {
             include_inner_stats: self.include_inner_stats,
         })
     }
+
+    fn flush_to_cache(&mut self, map: DbHashMap) -> PatriciaStorageResult<()> {
+        Self::flush_to_cache(self, map);
+        Ok(())
+    }
 }
 
 impl<S: AsyncStorage> Clone for CachedStorage<S> {

crates/starknet_patricia_storage/src/storage_trait.rs

@@ -155,6 +155,11 @@ pub trait Storage: Send + Sync {
 
     /// If the storage is async, returns an instance of the async storage.
     fn get_async_self(&self) -> Option<impl AsyncStorage>;
+
+    /// If uses a cache, flushes the given map into the cache.
+    fn flush_to_cache(&mut self, _map: DbHashMap) -> PatriciaStorageResult<()> {
+        Ok(())
+    }
 }
 
 /// A trait wrapper for [Storage] that supports concurrency.