Merge 'Adding checkpoint result' from Sonny

### What?
adding checkpoint result returning number of pages in wal and num pages
checkpointed.
Part of #696
### Context
SQLite returns in checkpoint result of calling `pragma wal_checkpoint;`
`0|3|3` while limbo returns `0|0|0`.
https://sqlite.org/pragma.html#pragma_wal_checkpoint
- 1st col: 1 (checkpoint SQLITE_BUSY) or 0 (not busy).
- 2nd col: # modified pages written to wal file
- 3rd col: # pages moved to db after checkpoint
This PR aims to add 2nd and 3rd column to the checkpoint result.
SQLite
```
sqlite3 test.db
sqlite> pragma journal_mode=wal;
wal
sqlite> pragma journal_mode;
wal
sqlite> create table t1 (id text);
sqlite> insert into t1(id) values (1),(2);
sqlite> select * from t1;
1
2
sqlite> pragma wal_checkpoint;
0|3|3
```
Limbo
```
./target/debug/limbo test.db
Limbo v0.0.13
Enter ".help" for usage hints.
limbo> pragma journal_mode;
wal
limbo> create table t1(id text);
limbo> insert into t1(id) values (1),(2);
limbo> select * from t1;
1
2
# current the 2nd and 3rd columns are hard coded in limbo to 0
limbo> pragma wal_checkpoint;
0|0|0
```

Closes #827

tests/integration/common.rs

@@ -13,13 +13,17 @@ pub struct TempDatabase {
 #[allow(dead_code, clippy::arc_with_non_send_sync)]
 impl TempDatabase {
     pub fn new_empty() -> Self {
-        let mut path = TempDir::new().unwrap().into_path();
-        path.push("test.db");
-        let io: Arc<dyn limbo_core::IO> = Arc::new(limbo_core::PlatformIO::new().unwrap());
+        Self::new("test.db")
+    }
 
+    pub fn new(db_name: &str) -> Self {
+        let mut path = TempDir::new().unwrap().into_path();
+        path.push(db_name);
+        let io: Arc<dyn IO> = Arc::new(limbo_core::PlatformIO::new().unwrap());
         Self { path, io }
     }
-    pub fn new(table_sql: &str) -> Self {
+
+    pub fn new_with_rusqlite(table_sql: &str) -> Self {
         let mut path = TempDir::new().unwrap().into_path();
         path.push("test.db");
         {
@@ -47,7 +51,7 @@ impl TempDatabase {
 pub(crate) fn do_flush(conn: &Rc<Connection>, tmp_db: &TempDatabase) -> anyhow::Result<()> {
     loop {
         match conn.cacheflush()? {
-            CheckpointStatus::Done => {
+            CheckpointStatus::Done(_) => {
                 break;
             }
             CheckpointStatus::IO => {
@@ -86,8 +90,9 @@ mod tests {
     #[test]
     fn test_statement_columns() -> anyhow::Result<()> {
         let _ = env_logger::try_init();
-        let tmp_db =
-            TempDatabase::new("create table test (foo integer, bar integer, baz integer);");
+        let tmp_db = TempDatabase::new_with_rusqlite(
+            "create table test (foo integer, bar integer, baz integer);",
+        );
         let conn = tmp_db.connect_limbo();
 
         let stmt = conn.prepare("select * from test;")?;