Add autosave with delay

[Dageus]

Implemented autosave functionality with a delay, which now refrains from formatting the code upon triggering unless the user manually saves it. Additionally, enhanced documentation for the format_on_save setting has been added. This resolves the issue where autosave with delay would inadvertently format the code, disrupting the user experience, as reported in the corresponding issue.

Release Notes:

• Fixed a bug where autosave after_delay would auto-format the buffer (#9787).

[ConradIrwin]

@Dageus Thanks for this!

I think we need to only ignore the format_on_save parameter if this was triggered by auto-save, so we need to put the if statement in pub fn autosave_item( instead.

[Dageus]

Thank you! I was unsure whether I was checking the auto save parameter in the correct place, so I will fix this asap and correct the PR.

[Linyuqiz]

Is this going to be merged soon?