forked from extern/nushell
* lazyframe definition * expressions and lazy frames * new alias expression * more expression commands * updated to polars main * more expressions and groupby * more expressions, fetch and sort-by * csv reader * removed open csv * unique function * joining functions * join lazy frames commands with eager commands * corrected tests * Update .gitignore * Update .gitignore Co-authored-by: JT <547158+jntrnr@users.noreply.github.com>