- Adding StdOutLogger and adding tests for DAG execution to verify it works.

- Roughing in FileSystemLogger
- Deleting Scheduler code and associated unit tests as being too complicated for maintenance.
- Refactoring namespaces for loggers and executors.

tests/unit_executor_forkingexecutor.cpp

@@ -1,12 +1,12 @@
 #include <iostream>
 #include <filesystem>
 
-#include "daggy/executors/ForkingTaskExecutor.hpp"
+#include "daggy/executors/task/ForkingTaskExecutor.hpp"
 
 #include "catch.hpp"
 
 TEST_CASE("Basic Execution", "[forking_executor]") {
-  daggy::executor::ForkingTaskExecutor ex(10);
+  daggy::executors::task::ForkingTaskExecutor ex(10);
 
   SECTION("Simple Run") {
     std::vector<std::string> cmd{"/usr/bin/echo", "abc", "123"};