feat: Support event callbacks and custom exceptions in MockFileSystem#883

vbreuss wants to merge 5 commits intoTestableIO:mainTestableIO/System.IO.Abstractions:mainfrom

vbreuss:feature/805-observe-changes-in-mock-file-systemvbreuss/System.IO.Abstractions:feature/805-observe-changes-in-mock-file-systemCopy head branch name to clipboard