chore: adjust the animation for FloatingMessage

[FeiWang1119]

add the closing animation for the message which can be closed automatically

Log:

[deepin-bot[bot]]

Doc Check bot :yellow_circle: some documents missing! File	Line	Symbol
src/private/dmessagemanager_p.h	27	Dtk::Quick::FloatingMessageContainer::FloatingMessageContainer
src/private/dmessagemanager_p.h	29	QVariant Dtk::Quick::FloatingMessageContainer::message
src/private/dmessagemanager_p.h	30	void Dtk::Quick::FloatingMessageContainer::setMessage
src/private/dmessagemanager_p.h	40	Q_SLOT Dtk::Quick::FloatingMessageContainer::pad0
src/private/dmessagemanager_p.h	44	void Dtk::Quick::FloatingMessageContainer::messageChanged
src/private/dmessagemanager_p.h	45	void Dtk::Quick::FloatingMessageContainer::durationChanged
src/private/dmessagemanager_p.h	46	void Dtk::Quick::FloatingMessageContainer::delayClose
src/private/dmessagemanager_p.h	58	Dtk::Quick::MessageManager

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: FeiWang1119, kegechen

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files: - **[debian/deepin/OWNERS](https://github.com/linuxdeepin/dtkdeclarative/blob/dev/animation/debian/deepin/OWNERS)** Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在FloatingMessageContainer类中，setImmediateClose方法被添加，但未在类定义中看到对应的方法声明。
• immediateClose属性的getter和setter方法被添加，但在类定义中未看到该属性的声明。
• delayClose信号在类中声明，但在类定义中未看到该信号的连接或触发操作。
• timerEvent方法中增加了对immediateClose属性的检查，但没有处理delayClose信号的情况。

是否建议立即修改:

• 是