Allow task sets in df.task.all and df.task.any

[CharlesGuillot]

Allow task sets in df.task.all and df.task.any typing

[davidmrdavid]

Hi @CharlesGuillot! Thank you for your contribution!! ⚡ ⚡

We're taking a close look at your PR, as we're trying to unify TaskSet and Task under the same identifier. In the future, we may remove TaskSet as a distinguishing identifier from Task so we still have to discuss whether or not this exact PR is something we'll want to merge, but we're driving a fix forward that will address this and a handful of other scenarios.

You can follow our discussion here: #185