bug#52242: 29.0.50; Feature Request: Offer to run`diff-buffer-with-file' in `recover-this-file' prompt

[Visuwesh]

`recover-this-file' quite helpfully shows the time of creation of the
auto-save file.  However, this is not always enough to decide whether I
should recover from said auto-save file since there's no way of knowing
if the changes in auto-save file are desirable [1] so I end up answering
yes, then run `diff-buffer-with-file' anyway.  I think having a
`diff-buffer-with-file' option like `save-some-buffers' would be a
quality-of-life improvement.

Thanks.
[1] I fat finger my keyboard quite a lot and end up garbling the file
even after explicitly saving the buffer.  When I open the file in a new
Emacs session again, I get suggested to `recover-this-file' and 8/10
times, I have to undo.  Having a diff option directly in the prompt
would save some keystrokes.

In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.27, cairo 
version 1.16.0)
Repository revision: da67e888d5360297cdf20cd3d2a1148727d16e5a
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12012000
System Description: NixOS 21.11 (Porcupine)

Configured using:
'configure
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Configured features:
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/nix/store/mlv737k3wph8lhxi2lm9942kbm31wmdz-emacs-gcc-20211030.0/share/emacs/29.0.50/lisp/emacs-lisp/let-alist

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