feat: avoid nesting in Behavior Factories

[Roiocam]

similar like #1444, but apply to timer and stash:

those nestings are pretty annoying, especially when i using AOSP format.

-          Behaviors.withTimers(t-> 
-              Behaviors.setup(ctx-> {
-                   // preStart something on here
-                  return new BehaviorXX();
-           }));
+          Behaviors.withTimersSetup((t, ctx) -> {
+             // preStart something on here
+              return new BehaviorXX();
+          });

[He-Pin]

@Roiocam Thanks, Tests is required too.