FEAT: create adaptor for converting ClawBench tasks into harbor-compatible format

[Perry2004]

• Add an adaptor program to convert ClawBench task directories into Harbor-compatible format.
• Harbor's expected task definition: https://www.harborframework.com/docs/tasks
• https://www.harborframework.com/docs/datasets/adapters-human
• The adaptor should be exposed as a separate command in the existing clawbench-eval package.