Implement 'format without save' (#8806)

This solves a major usability problem in Zed, that there's no way to
temporarily disable auto formatting without toggling the whole feature
off.

fixes https://github.com/zed-industries/zed/issues/5230

Release Notes:

- Added a new `workspace::SaveWithoutFormatting`, bound to `cmd-k s`, to
save a file without invoking the auto formatter.

crates/zed/src/zed.rs

@@ -1979,7 +1979,7 @@ mod tests {
                     editor.newline(&Default::default(), cx);
                     editor.move_down(&Default::default(), cx);
                     editor.move_down(&Default::default(), cx);
-                    editor.save(project.clone(), cx)
+                    editor.save(true, project.clone(), cx)
                 })
             })
             .unwrap()