Add filesystem notification (fsnotify) support#714
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This PR adds support for guest-side filesystem notifications for apple/container#141. It adds a
NotifyFileSystemEventgRPC RPC so the host can send filesystem events to the guest. A dedicated worker thread enters the container's mount namespace withsetns()and triggers synthetic inotify events using no-op chmod, which producesIN_ATTRIB. The worker uses a Mutex protected queue with pipe-based IPC. I'll add the host-side file watching tocontainerlater.