build(wasm): libconstants can now compile to wasm and run as a wasm module

examples/meson.build

@@ -0,0 +1 @@
+executable('simple_constant_usage', 'simple.cpp', dependencies: [const_dep])

examples/simple.cpp

@@ -0,0 +1,13 @@
+#include "fourdst/constants/const.h"
+#include <iostream>
+
+int main() {
+  fourdst::constant::Constants& C = fourdst::constant::Constants::getInstance();
+  
+  std::cout << "Speed of light is " << C.get("c") << std::endl;
+  std::cout << "All avalible constants are: ";
+
+  for (const auto& key : C.keys()) {
+    std::cout << "\t " << key << ": " << C[key];
+  }
+}