Productize Task/ValueTask/Async.`ignore`

[bartelink]

I've long felt icky about using Async.Ignore. Seeing the Async.ignore that's presently hiding in plain sight here makes me realise the absence of a Task.ignore and ValueTask.ignore from FSharp.Core is something I've also been grinning and bearing (sprinkling :> Task and all sorts of other such mindless hacks). Utils.fs presently has helpers that feel very tempting to use more broadly. However, binding to a set of support helpers on the fringe of this library's core feature set is obviously debatable.

(The other pair from here that I feel deserves a canonical implementation in a library that doesn't include a jungle of other less-related helpers is Async.ofTask/Task.toAsync, but with corrected AggregateException semantics, and honoring of Async.Cancellation when compared to Async.AwaitTask as per FSharp.Core. Will likely calve off a separate issue from this if placeholder FSharp.Core.TaskShims package/repo is deemed to be the best home for a set of ignore helpers)

related:

• precursor discussion in PR comments
• add AwaitTaskCorrect to FSharp.Core suggestion

[abelbraaksma]

/cc @dsyme, we should discuss this. Some of this effort may ultimately land back into F# Core, but agreeing on a TaskEx library (name tbd) and adding it to the FsProjects realm may be a good idea.

This is related to #78, specifically #78 (comment).

[TheAngryByrd]

Yeah I have a lot of the same functions floating around in IcedTasks (example1, example2) and FsToolkit (example1, example2)

I even have a tool that writes out all the functions (like map, bind, apply, zip, etc) and which libraries contain them because it's hard to know who implementing what these days and where the gaps are in functionality.

[bartelink]

Closing in favor of #139 (general high level discussion about shimming and/or libraries/projects) and #140 (ignore helpers only)

[bartelink]

Switching close reason; work is not completed; sorry!

[abelbraaksma]

Thanks for writing out these covering issues! Much appreciated!