feat: implement module access in engine API

- Add implementation for `getModule`
- Add implementation for `getLoadedModules`

include/engine/core/engine_module_api.hpp

@@ -2,8 +2,10 @@
 #define __MSC_ENGINE_MODULE_API_HPP__
 
 #include <engine/core/engine_bus.hpp>
-
-typedef void UNIMPL;
+#include <engine/core/engine_module.hpp>
+#include <cstdint>
+#include <string>
+#include <unordered_map>
 
 class IMscEngineModuleAPI
 {
@@ -14,7 +16,10 @@ public:
   virtual MscEventBus &getBus() = 0;
 
   /// Get access to loaded module list
-  virtual UNIMPL getLoadedModules() const = 0;
+  virtual std::unordered_map<std::string, std::uint16_t> getLoadedModules() const = 0;
+
+  /// Access module by its name
+  virtual MscEngineModule &getModule(const std::string &name) = 0;
 };
 
 #endif // __MSC_ENGINE_MODULE_API_HPP__