feat(NIOFileSystem): Add idempotent directory creation behavior (#3404)#3410

glbrntt merged 5 commits intoapple:mainapple/swift-nio:mainfrom

HamzaHassanain:hamzahassanain/fix-idempotent-create-directoryHamzaHassanain/swift-nio:hamzahassanain/fix-idempotent-create-directoryCopy head branch name to clipboard