Implement employee creation

<UserStory>EMP001 Create Employee</UserStory>

<Changes>
- Updated employee creation flow to support different employee types and designations
- Set a default initial password for new employees
- Added basic authorization check utility
- Cleaned up employee model constructors for better consistency
Minor code cleanup and refactoring
</Changes>

<Review>
Smitha Mohan
</Review>

Trenser.Zenvy/Trenser.Zenvy/models/HRManager.h

@@ -3,16 +3,14 @@
 
 class HRManager : public Employee
 {
+public:
     HRManager() = default;
     HRManager(
-        const std::string& password,
         const std::string& name,
         const std::string& phone,
         const std::string& email,
-        const std::string& teamId,
         std::shared_ptr<Payroll> payroll
-    ) :Employee(password, name, phone, email, teamId, Enums::EmployeeType::GENERAL, payroll) {
-    };
+    ) :Employee(name, phone, email, Enums::EmployeeType::HR, payroll) {};
     ~HRManager() = default;
 };