build(wasm): libconfig now builds and works in wasm

examples/config_example.yml

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+men: ["John Smith", "Bill Jones"]
+women:
+  - Karol Boudreaux
+  - Emily Boudreaux

examples/meson.build

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+executable('simple_config_test', 'simple.cpp', dependencies: [config_dep])
+executable('simple_config_wasm_test', 'wasm.cpp', dependencies: [config_dep])

examples/simple.cpp

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+#include "fourdst/config/config.h"
+#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);
+    }
+
+    std::filesystem::path const file_path{ argv[1] };
+
+    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);
+    }
+
+    return file_path.string();
+}
+
+int main(int argc, char* argv[]) {
+  fourdst::config::Config& config = fourdst::config::Config::getInstance();
+
+  std::string filename = get_validated_filename(argc, argv);
+  config.loadConfig(filename);
+
+  auto men = config.get<std::vector<std::string>>("men", {});
+
+  for (const auto& name : men) {
+    std::cout << "men are " << name << std::endl;
+  }
+
+}

examples/wasm.cpp

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+#include "fourdst/config/config.h"
+#include <string>
+#include <vector>
+#include <iostream>
+#include <filesystem>
+
+
+int main(int argc, char* argv[]) {
+  fourdst::config::Config& config = fourdst::config::Config::getInstance();
+
+  config.loadConfig("/input.yaml");
+
+  auto men = config.get<std::vector<std::string>>("men", {});
+
+  for (const auto& name : men) {
+    std::cout << "men are " << name << std::endl;
+  }
+
+}