feat: refactor auth package and add get users for staff

internal/accessor/user/create_user.go

@@ -0,0 +1,13 @@
+package userrepository
+
+import (
+	userdomain "legalgo-BE-go/internal/domain/user"
+)
+
+func (ur *accessor) CreateUser(spec userdomain.User) error {
+	if err := ur.db.Create(&spec).Error; err != nil {
+		return err
+	}
+
+	return nil
+}