rename to store_by_key and make it a store of a one length array

Co-authored-by: Richard Pringle <richard.pringle@avalabs.org>
Signed-off-by: Franfran <51274081+iFrostizz@users.noreply.github.com>

x/programs/rust/wasmlanche-sdk/src/state.rs

@@ -51,9 +51,16 @@ impl<'a, K: Key> State<'a, K> {
         pairs: Pairs,
     ) -> Result<(), Error> {
         let cache = &mut self.cache.borrow_mut();
-        for (key, value) in pairs {
-            Self::store_internal(cache, key, value)?;
-        }
+
+        pairs
+            .into_iter()
+            .map(|(k, v)| borsh::to_vec(&v).map(|bytes| (k, Some(bytes))))
+            .try_for_each(|result| {
+                result.map(|(k, v)| {
+                    cache.insert(k, v);
+                })
+            })
+            .map_err(|_| StateError::Serialization)?;
 
         Ok(())
     }
@@ -63,9 +70,8 @@ impl<'a, K: Key> State<'a, K> {
     /// # Errors
     /// Returns an [`Error`] if the key or value cannot be
     /// serialized or if the host fails to handle the operation.
-    pub fn store_single<V: BorshSerialize>(self, key: K, value: &V) -> Result<(), Error> {
-        let cache = &mut self.cache.borrow_mut();
-        Self::store_internal(cache, key, value)
+    pub fn store_by_key<V: BorshSerialize>(self, key: K, value: &V) -> Result<(), Error> {
+        self.store([(key, value)])
     }
 
     fn store_internal<V: BorshSerialize>(