libsql: Fix total_changes accumulation for SQL over HTTP batch execution (#2220)

The batch_inner() updates affected_row_count but never adds it to
total_changes. Only finalize() did, so total_changes was missing the
contributions of all intermediate batch/execute operations.

Found while investigating
tursodatabase/libsql-client-ts#312

Author: penberg

libsql/src/hrana/stream.rs

@@ -163,6 +163,9 @@ where
                     self.inner
                         .affected_row_count
                         .store(result.affected_row_count, Ordering::SeqCst);
+                    self.inner
+                        .total_changes
+                        .fetch_add(result.affected_row_count, Ordering::SeqCst);
                     if let Some(last_insert_rowid) = result.last_insert_rowid {
                         self.inner
                             .last_insert_rowid