Good WDL Debugging Experience

[unito-bot]

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We should have some plausible developer experience writing and debugging WDL workflows on Toil.

It should be as good as or better than debugging WDL workflows with Cromwell.

┆Issue is synchronized with this Jira Story ┆Epic: Improve debugging experience ┆Issue Number: TOIL-1405

[unito-bot]

➤ Adam Novak commented:

We should solicit complaints from Phoenix users about WDL errors that Toil did not help them with.