Provide a build convention plugin for command line tools, and use
`libs.versions.toml` for command line tool dependencies. Adjust the
individual tool `build.gradle.kts` files accordingly.
Remove unnecessary `gradle.properties` and `settings.gradle` files for
projects that are included as subprojects, not included builds.
Add a trivial test for each command line tool so there are tests to run
and provide some confidence that automated library upgrades don't break
command line tool compilation.
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