feat: add dde session boot time and memory analysis tool

Add a professional boot time analysis script for DDE session.
- Displays systemd user service timelines and critical paths.
- Provides reliable systemd-analyze blame data by filtering notification/dbus types.
- Lists session processes with memory usage and relative start times.
- Analyzes dde-shell and desktop logs for internal bottlenecks.
- Validates systemd service configurations and gives optimization advice.

新增 DDE 会话启动耗时及内存分析专业脚本。
- 显示 systemd 用户服务启动时间线和关键路径耗时。
- 通过过滤 notification/dbus 类型提供可靠的 systemd-analyze blame 数据。
- 列出会话进程及其内存占用和相对启动时刻。
- 分析 dde-shell 和桌面日志以识别内部瓶颈。
- 验证 systemd 服务配置并提供具体的优化建议。

Log: add dde session boot time analysis tool
Pms: TASK-384099
Change-Id: Ib6fa8374eacc3c93822c1c17b3301386d42c92d9

Author: yixinshark