5.0.0-beta009

• BREAKING: Remove Ply and update to FSharp 6 Credits @TheAngryByrd
• BREAKING: Remove MergeSources (and!) from some implementations like Result Credits @TheAngryByrd
• BREAKING: Merge TaskResult into Core library Credits @TheAngryByrd
• This means FsToolkit.ErrorHandling.TaskResult is no longer a separate package and will not be updated. It is now part of the core library.
• BREAKING: Rename retn to singleton Credits @1eyewonder
• BREAKING: Rename returnError to error + documentation Credits @tw0po1nt
• Use Microsoft.Bcl.AsyncInterfaces in netstandard2.0 (Allows IAsyncDisposable and IAsyncEnumerable) Credits @TheAngryByrd
• Build against Net8 Credits @TheAngryByrd
• Fix Overload Resolution to Align to Computation Expression used Credits @TheAngryByrd
• refactor!: Seq.sequenceResultM returns Array instead of seq Credits @bartelink
• feat(Seq): sequenceResultA Credits @bartelink
• Updated uses of Seq.append Credits @1eyewonder
• Add Option.traverseAsync and Option.sequenceAsync Credits @tw0po1nt
• Add Require and Check helper methods Credits @PI-Gorbo
• Add new AsyncOption APIs and document all its other functions; minor fixes to documentation for Option module Credits @tw0po1nt
• F# 9 support and nullness Credits @TheAngryByrd
• Update IcedTasks 0.11.7 Credits @TheAngryByrd
• Add TaskValidation module Credits @tw0po1nt
• feat(Seq.traverse/sequence*)!: Yield arrays Credits @bartelink