fix: Add missing solutions to questions 5-10 for the 24. More Dataframe Transformations Lesson

Add missing solutions to questions 5-10 for the 24. More Dataframe Transformations Lesson

This corresponds to the 05-working-with-dataframe.ipynb notebook.

I also added order by Delay desc to the Q10 SQL since that matched the video and also didn't match the given question.

Signed-off-by: mvaal <mvaal@expediagroup.com>

Author: mvaalexp