feat: add eventlogger.hpp header for DDE applications

Add a C++ header-only event logger that can be used by DDE applications
to log user behavior events. The logger uses dlopen to dynamically load
libdeepin-event-log.so library at runtime.

Features:
- Header-only implementation, no linking required
- Dynamic library loading with QLibrary
- System edition check (only UosProfessional enabled by default)
- Debug mode macro for testing on other editions
- LGPL-3.0-or-later license for easy integration

添加用于DDE应用程序的事件日志头文件。日志记录器使用dlopen在运行时动态加载
libdeepin-event-log.so库。

Log: 添加事件日志头文件
PMS: TASK-388657

Author: Ivy233