Proposing rustfmt.toml changes

[Mitchell Kember]

Hi,

I'm proposing to change mercurial's Rust style in rustfmt.toml. I've made a
merge request to show what it would look like:

https://foss.heptapod.net/mercurial/mercurial-devel/-/merge_requests/1275

Specifically:

   - Format imports to be consistent (one per line), and arrange them in
   groups.
   - Change the max line width from 79 to 80.
   - Disable the "small heuristics" which causes wrapping much earlier than
   max_width.

Since this affects all contributors, and formatting always brings out
strong opinions, I thought I'd start a discussion here. Let me know if you
are in favor or have any objections.


Mitchell
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