[Repo Assist] Add AsyncSeq.last, item, tryItem#259

dsyme merged 3 commits intomainfsprojects/FSharp.Control.AsyncSeq:mainfrom

repo-assist/improve-last-item-df3fa74494af1aa5fsprojects/FSharp.Control.AsyncSeq:repo-assist/improve-last-item-df3fa74494af1aa5Copy head branch name to clipboard