`BTreeTable::to_sql` makes us incompatible with SQLite by losing e.g. the original whitespace provided during the CREATE TABLE command.
For now let's fix our tests by regex-replacing every CREATE TABLE in
the entire repo to have exactly 1 space after the table name in the
CREATE TABLE statement.
also added a `cursor_loop` helper on `ProgramBuilder` to avoid making
this mistake in the future. this is zero-cost, and will be optimized to
the same thing (hopefully).
