Add get_column_pairs_plot utility method

[katxiao]

Problem Description

Add a visualization utility method to visualize a pair of columns.

Use the get_column_pairs_plot utility method to visualize the trends between a pair of columns for real and synthetic data

• (required) real_data: A pandas.DataFrame containing 2 columns of real data
• (required) synthetic_data: A pandas.DataFrame containing the same 2 columns of synthetic data
• (required) sdtypes: A list of 2 strings, describing the data type of each column. The strings must be one of: 'numerical', 'datetime', 'categorical' or 'boolean'

Returns: A plotly.Figure object

Expected behavior

import sdmetric.report.utils

utils.get_column_pairs_plot(real_data, synthetic_data, sdtypes)