Update Drop Functionality

[Ethan-DeBandi99]

PR #1177 in the arkouda repo updates the functionality of ak.DataFrame.drop() to include the ability to drop columns.

The DataFrame Demo notebooks should be updated to reflect these changes once PR #1177 is merged.

Link to PR for convience:
Bears-R-Us/arkouda#1177

[egelberg]

@Ethan-DeBandi99 or @pierce314159 FYI that this is still an issue within the DataFrame Demo notebook, under the "Drop Functionality" section. Modifying
df.drop('userName')
to
df.drop('userName', axis=1)
fixed it for me

[egelberg]

Scratch that, it's not an inplace drop, had to modify it to
df = df.drop('userName', axis=1)
to get it to work