Document the message bus as an integration point

[unito-bot]

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We should have a tutorial showing how you can write your own code to read the Toil message bus and monitor what is happening with Toil jobs in a workflow run.

┆Issue is synchronized with this Jira Task ┆Issue Number: TOIL-1307

[unito-bot]

➤ Adam Novak commented:

A lot of what one might do with this might be better done through WES, if you can have a WES server.