Implement `describe()` method in datafusion-python

[simicd]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
As suggested by @alamb in apache/datafusion#5226 (review) introduce the newly added describe() dataframe method in the Python bindings.

Describe the solution you'd like
Implement describe in Python bindings

Describe alternatives you've considered
n/a

Additional context
n/a