Add asyncValidation CE, or make asyncResult (and result?) CEs work with 'and!' about fstoolkit.errorhandling HOT 4 OPEN

Yeah I considered adding an asyncValidation in the past but it wasn’t something I needed.

I’m not sure how adding it to result would work as it would making dealing with list and non list would be difficult. If there’s no real performance benefits of the and! in result then it makes sense to remove it. Additionally MergeSouces to asyncResult means does async actually run in parallel here too? Don thinks it should be its own CE for various reasons.

I’d accept a PR for an asyncValidation/taskValidation/jobValidation.

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Thanks for approving this. Unfortunately I'm swamped both at work and at home right now, so I have no capacity to create a PR for this (which would require me to understand the internals of the validation and asyncResult CEs and "merge" them accordingly, write/adapt lots of tests, etc.)

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taskValidation is quite useful and encompasses everything, http/db calls requests, etc.

If anyone wants to take upon this, you can use this as a starting point. This fulfills my current needs but I don't have the capacity to expand this further atm.

https://gist.github.com/Swoorup/ae556dddf4926faa3209a7ffaaa45cc4

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