Add name to WHEN_TIMEOUT error if available

[evelant]

It's useful to have a name attached to the WHEN_TIMEOUT error for debugging/tracing. Since when already takes a name as an option this PR just adds the name to the WHEN_TIMEOUT error if it is available.

Code change checklist

• [X ] Added/updated unit tests
• [X ] Updated /docs. For new functionality, at least API.md should be updated
• [X ] Verified that there is no significant performance drop (yarn mobx test:performance)

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Latest commit: 650166f

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[mweststrate]

Sorry for the late follow up. I imagine WHEN_TIMEOUT is an error message that is programmatically checked against in catch handlers, so I think it'd be better to store the debug name in a separate property on the same error object. E.g whenName or something like that.