Provide an artifact that's "just" the executable

In some cases, where the executable has no dependencies on other files to be present, the target executable could be provided as-is - without zipping it. I think this might be useful if you're for example creating GUI apps, so you wouldn't need to unzip them before running them.

The issue names no files, tests, or entry points. Start by locating the artifact-generation and packaging flow in cargo-dist, then determine how dependency-free executables are represented alongside archive artifacts. Done means a dependency-free executable can be published as-is while existing packaged outputs continue to work.

Written by the indexing model from the issue text.