Introduce a "session timeout" counter in GUI

##### ISSUE TYPE

* Feature Idea

##### COMPONENT NAME

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UI
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##### CLOUDSTACK VERSION

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4.17.0.1
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##### CONFIGURATION

N/A

##### OS / ENVIRONMENT

N/A

##### SUMMARY

I would like to have a "counter" in the UI showing the time until the current session is closed and the user needs to authenticate again. In addition a button to "refresh" the session / restart the session time-out would be quite convenient.
For positioning i would suggest to place this in the top menue right beside the username and button for changeing the language-settings


##### STEPS TO REPRODUCE

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##### EXPECTED RESULTS

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##### ACTUAL RESULTS

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該 issue 將 CloudStack GUI 和頂部選單確定為目標區域。首先追蹤 GUI 如何管理驗證工作階段，以及使用者名稱和語言控制項如何進行轉譯。完成的標準是 UI 顯示剩餘工作階段時間，並提供一種可正常運作的工作階段重新整理方式。

由索引模型根據 Issue 內容生成。