add btree fuzz tests which generate seed file from scratch

tests/integration/query_processing/test_multi_thread.rs

@@ -0,0 +1,27 @@
+use crate::common::TempDatabase;
+
+#[test]
+fn test_schema_change() {
+    let tmp_db = TempDatabase::new_empty(false);
+    let conn1 = tmp_db.connect_limbo();
+    conn1.execute("CREATE TABLE t(x, y, z)").unwrap();
+    conn1
+        .execute("INSERT INTO t VALUES (1, 2, 3), (10, 20, 30)")
+        .unwrap();
+    let conn2 = tmp_db.connect_limbo();
+    let mut stmt = conn2.prepare("SELECT x, z FROM t").unwrap();
+    conn1.execute("ALTER TABLE t DROP COLUMN x").unwrap();
+    let row = loop {
+        match stmt.step() {
+            Ok(turso_core::StepResult::Row) => {
+                let row = stmt.row().unwrap();
+                break row;
+            }
+            Ok(turso_core::StepResult::IO) => {
+                stmt.run_once().unwrap();
+            }
+            _ => panic!("unexpected step result"),
+        }
+    };
+    println!("{:?} {:?}", row.get_value(0), row.get_value(1));
+}