Validate input data types for single column and column pair metrics

[katxiao]

Problem Description

The ColumnPairMetric and SingleColumnMetric metrics should verify that the input data is of the expected data type for the metric, and raise a user-friendly error if not. Currently, the expected data types for each metric are specified on the single-table metric level. There is little validation of the input data within the column metric itself. If a user were to directly call the column pair or single column metric with unsuitable data, the behavior is currently unpredictable.

Expected behavior

A user-friendly error should be returned when data of an incompatible data type is passed into a single column or column pair metric.