[#73] Uploader, downloader structures refactoring

Signed-off-by: Marina Biryukova <m.biryukova@yadro.com>

cmd/http-gw/main.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"context"
+	"os/signal"
+	"syscall"
+)
+
+func main() {
+	globalContext, _ := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
+	v := settings()
+	logger, atomicLevel := newLogger(v)
+
+	application := newApp(globalContext, WithLogger(logger, atomicLevel), WithConfig(v))
+	go application.Serve()
+	application.Wait()
+}