Start implementing UserService

- add UserController
- add getUsers method with pagination
- handle auth errors using enum

src/services/UserManager.cpp

@@ -8,6 +8,7 @@
 #include "dependency_injection/DependencyContainer.h"
 #include "models/User.h"
 #include "services/encryption/PasswordEncryptor.h"
+#include "services/enums/AuthErrorCode.h"
 
 std::string PUBLIC_KEY{
 R"(-----BEGIN PUBLIC KEY-----
@@ -48,9 +49,9 @@ bool UserManager::validateCredentials(const User& userData, std::string&& rawPas
 	return hashedPassword == userData.passwordHash;
 }
 
-bool UserManager::validateRegisterData(const RegisterRequestDto& registerData)
+AuthErrorCode UserManager::validateRegisterData(const RegisterRequestDto& registerData)
 {
-	return true;
+	return AuthErrorCode::Ok;
 }
 
 std::string UserManager::generateToken(const User& userData)