Add autosave function to Okular

[Wen Chang]

Dear KDE maintainers,

I have used the Okular for a while.
I wonder whether it would be good to have
the autosave option similar to the function in vscode.
This way, the annotation will not disappear if the users
forgot to save their update.
I am willing to responsible for this update.
Feel free to let me know.
This is my first time working with KDE.
Please let me know the contribution policy, thank you.

Best,
Wen
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