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](https://github.com/zed-industries/zed/issues/9787)).

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Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>