Formatting `using` statements in explicit blocks

[RobertCraigie]

imo it'd be quite cool if there was a way to format using statements like this

const proc = await glide.process.spawn("cat");

{await using writer = proc.stdin.get_writer();
  await writer.write("first\n");
  await writer.write("second\n");
  await writer.write("third");
}

const text = await proc.stdout.text();

compared to the default formatting that currently looks like this

{
  await using writer = proc.stdin.get_writer();
  await writer.write("first\n");
  await writer.write("second\n");
  await writer.write("third");
}

where there's less of a visual distinction between the "important" part of the block, the using statement, and the rest of the block.

note: I'm unsure if there's already been discussion about special formatting for using in other places.