Generalize socket cancellation and update API accordingly

cmd/test/main.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"go.arsenm.dev/itd/api"
+)
+
+func main() {
+	itd, _ := api.New(api.DefaultAddr)
+	defer itd.Close()
+
+	fmt.Println(itd.Address())
+
+	mCh, cancel, _ := itd.WatchMotion()
+
+	go func() {
+		time.Sleep(10 * time.Second)
+		cancel()
+		fmt.Println("canceled")
+	}()
+
+	for m := range mCh {
+		fmt.Println(m)
+	}
+
+}