feat: add lockscreen protocol for ShutdownApplet

[18202781743]

as title.

[18202781743]

@xionglinlin

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, yixinshark

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[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在treelandlockscreen.cpp文件中，workder函数拼写错误，应为worker。
• treelandlockscreen.cpp文件中的shutdown函数和switchUser函数缺少对impl指针的空指针检查。
• treelandlockscreen.cpp文件中的shutdown函数和switchUser函数可能需要异常处理机制，以防止在调用impl时发生错误。
• treelandlockscreen.h文件中的TreeLandLockScreen类缺少对lock函数的注释说明。
• treelandlockscreen.h文件中的TreeLandLockScreenWorker类缺少对lock函数的注释说明。
• lockscreen-example/package/main.qml文件中的lockscreenApplet函数缺少对DS.applet返回值的空指针检查。
• lockscreen-example/package/main.qml文件中的lockscreenApplet函数可能需要异常处理机制，以防止在调用DS.applet时发生错误。

是否建议立即修改:
是

[18202781743]

/forcemerge

[deepin-bot]

This pr force merged! (status: blocked)