cli_util: make running an editor on a tempfile easier #2868
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This consolidates a bunch of boilerplate io+tempfile code used in sparse.rs and description_util.rs into cli_util.rs, making the two call sites much simpler. This makes it easier for future callers to invoke the workflow of 'have the user edit this arbitrary string' without going through extra setup.
Checklist
If applicable:
CHANGELOG.md