Log and document output directory (#12)

[molereddy]

What does this PR do?

• Log where the output_dir of trainer and evaluator are
• Log each evaluation output file path

Fixes # (issue)

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Have you gone through the contributions guide?
• Are your changes documented? Read documentation guidelines here.