[Testing] pretty print for cli output

Migration from https://github.com/aws/aws-durable-execution-sdk-python-testing/issues/55

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## overview
Add a pretty print output for viewing the results of an execution in a terminal.

## eelated
- https://github.com/aws/aws-durable-execution-sdk-js/blob/development/packages/aws-durable-execution-sdk-js-testing/src/test-runner/local/result-formatter.ts#L75

## acceptance criterua
1. pretty print of execution output available from the cli

Start by locating the Python CLI entry point that displays execution results, then compare its current output with the related formatter in the JavaScript SDK at packages/aws-durable-execution-sdk-js-testing/src/test-runner/local/result-formatter.ts. Add terminal-friendly pretty printing for execution output and verify that the CLI exposes it as described in the acceptance criterion.

Written by the indexing model from the issue text.