[SPARK-16546][SQL][PYSPARK] update python dataframe.drop

## What changes were proposed in this pull request?

Make `dataframe.drop` API in python support multi-columns parameters,
so that it is the same with scala API.

## How was this patch tested?

The doc test.

Author: WeichenXu <WeichenXu123@outlook.com>

Closes #14203 from WeichenXu123/drop_python_api.