Change default metrics for evaluate

[amontanez24]

Problem Description

As a user, it is confusing when multi-table metrics are applied to single table data. Also many of the metrics seem to result in errors.

Expected behavior

• When running evaluate, the following metrics should be applied by default in the single table case
  • CSTest
  • KSTest
• In the multi-tale case, the multi-table version of the following metrics should be used
  • CSTest
  • KSTest

Additional context

The metrics to use are currently selected in this method:

SDV/sdv/evaluation.py

Line 74 in 65c8b53

def _select_metrics(synthetic_data, metrics):

We should change this to only use the metrics described above. One thing to note is that if a user provides metadata and a single table as input, it will crash because of this line

SDV/sdv/evaluation.py

Line 130 in 65c8b53

table = list(metadata['tables'].keys())[0]

This is not necessary to fix for this issue, but if it's easy enough then we should make the change