Introduce Pallet paged-list

frame/support/src/storage/mod.rs

@@ -160,6 +160,21 @@ pub trait StorageValue<T: FullCodec> {
 	}
 }
 
+pub trait StoragePagedList<V: FullCodec> {
+	fn append<Item, EncodeLikeItem>(item: EncodeLikeItem)
+	where
+		Item: Encode,
+		EncodeLikeItem: EncodeLike<Item>;
+}
+
+pub trait IterableStorageList<V: FullCodec> {
+	type Iterator: Iterator<Item = V>;
+
+	fn iter() -> Self::Iterator;
+
+	fn drain() -> Self::Iterator;
+}
+
 /// A strongly-typed map in storage.
 ///
 /// Details on implementation can be found at [`generator::StorageMap`].

frame/support/src/storage/types/mod.rs

@@ -27,6 +27,7 @@ mod double_map;
 mod key;
 mod map;
 mod nmap;
+mod paged_list;
 mod value;
 
 pub use counted_map::{CountedStorageMap, CountedStorageMapInstance};
@@ -37,6 +38,7 @@ pub use key::{
 };
 pub use map::StorageMap;
 pub use nmap::StorageNMap;
+pub use paged_list::StoragePagedList;
 pub use value::StorageValue;
 
 /// Trait implementing how the storage optional value is converted into the queried type.