AccountSharedData.set_data (#15781)

* account.set_data and resize_data

* remove data_resize

sdk/src/account.rs

@@ -394,6 +394,9 @@ impl Account {
 }
 
 impl AccountSharedData {
+    pub fn set_data(&mut self, data: Vec<u8>) {
+        self.data = data;
+    }
     pub fn new(lamports: u64, space: usize, owner: &Pubkey) -> Self {
         shared_new(lamports, space, owner)
     }
@@ -530,6 +533,17 @@ pub mod tests {
         (account1, account2)
     }
 
+    #[test]
+    fn test_account_data_set_data() {
+        let key = Pubkey::new_unique();
+        let (_, mut account) = make_two_accounts(&key);
+        assert_eq!(account.data(), &vec![0, 0]);
+        account.set_data(vec![1, 2]);
+        assert_eq!(account.data(), &vec![1, 2]);
+        account.set_data(vec![]);
+        assert_eq!(account.data().len(), 0);
+    }
+
     #[test]
     #[should_panic(
         expected = "called `Result::unwrap()` on an `Err` value: Io(Kind(UnexpectedEof))"