[Core-Enhances] Refactor `TaskExecutorManager$1.class` to a descriptive name

It will be better to refactor this [anonymous class](https://github.com/Software-Hardware-Codesign/Jector/blob/c336106debad929ef4956f98610de7619756aef3/jector/src/main/java/com/avrsandbox/jector/core/work/TaskExecutorsManager.java#L216-L225) to a private class with a proper name describing what it really does, in this case, it executes a method stack, so a `MethodStack` or `StackExecutor` or `StackHandler` may be better, it will be likely a `StackHandler`.