feat(report): allow flattened report

[poshinchen]

Description

Now we're generating list of reports given multiple evaluators passed in an experiment. This feature allows users to flatten it with an average score.

Before:

reports = experiment.run_evaluations(user_task_function)
report[0].run_display()

Example:

# 5. Run evaluations
reports = experiment.run_evaluations(user_task_function)

# 6. Flatten the reports to see all evaluators in one view
flattened = EvaluationReport.flatten(reports)  <--- main change here
flattened.run_display()

Related Issues

N/A

Documentation PR

N/A

Type of Change

Bug fix

Testing

How have you tested the change? Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli

• I ran hatch run prepare

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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[afarntrog]

Can you share a before and after?