Implement init/deinit of inotify system

Use RAII to handle inotify resource lifetime, i.e. initialize with actor
creation and deinitialize with actor deletion.

Sources/Inotify/Inotify.swift

@@ -1,2 +1,16 @@
-actor Inotify {
+import CInotify
+
+public actor Inotify {
+	private let fd: Int32
+
+	public init() throws {
+		self.fd = inotify_init1(Int32(IN_NONBLOCK | IN_CLOEXEC))
+		guard self.fd >= 0 else {
+			throw InotifyError.initFailed(errno: cinotify_get_errno())
+		}
+	}
+
+	deinit {
+		cinotify_deinit(self.fd)
+	}
 }