feat(TOML & Glaze): YAML -> TOML

YAML is a horrid format with far too many edge cases. We have switched
to TOML. Further, we have completly reworked the framework so that

1. There is no longer any global config state. Config objects now must
be passed between scopes by the caller. This will introduce some more
friction but whill also make order of initialization clear
2. Config objects are now strongly typed and there is a single sourth of
truth for any given config object baked in using the some struct.

examples/simple.cpp

@@ -1,35 +1,46 @@
 #include "fourdst/config/config.h"
+#include "glaze/glaze.hpp"
 #include <string>
 #include <vector>
-#include <iostream>
-#include <filesystem>
 
-std::string get_validated_filename(int argc, char* argv[]) {
-    if (argc != 2) {
-        std::cout << "Usage: " << argv[0] << " <input_file>" << std::endl;
-        exit(1);
-    }
+using namespace fourdst::config;
 
-    std::filesystem::path const file_path{ argv[1] };
+struct sub {
+    double x;
+    double y;
+};
 
-    if (not std::filesystem::exists(file_path) || not std::filesystem::is_regular_file(file_path)) {
-        std::cout << "Error: File does not exist or is not a regular file." << std::endl;
-        exit(1);
-    }
+struct BoundaryConditions {
+    double pressure = 1e6;
+    sub sub;
+};
 
-    return file_path.string();
-}
+struct ExampleConfig  {
+    double parameterA = 1.0;
+    int parameterB = 1.0;
+    std::string parameterC = "default_value";
+    std::vector<double> parameterD = {0.1, 0.2, 0.3};
+    BoundaryConditions boundaryConditions;
+};
 
-int main(int argc, char* argv[]) {
-  fourdst::config::Config& config = fourdst::config::Config::getInstance();
+struct Person {
+    int age;
+    std::string name;
+};
 
-  std::string filename = get_validated_filename(argc, argv);
-  config.loadConfig(filename);
+struct AppConfig {
+    double x;
+    double y;
+    Person person;
+};
 
-  auto men = config.get<std::vector<std::string>>("men", {});
+int main() {
+    const Config<ExampleConfig> cfg;
+    cfg.save();
+    cfg.save_schema(".");
 
-  for (const auto& name : men) {
-    std::cout << "men are " << name << std::endl;
-  }
-
-}
+    Config<AppConfig> loaded;
+    loaded.save_schema(".");
+    loaded.load("config_example.toml");
+    std::println("{}", loaded);
+}