Correctly populate version in `ToolInfo`

[matthewnitschke-wk]

The version within ToolInfo is currently hardcoded to 0.0.1, this should instead be the version currently within the pubspec.yaml file

All of the current pubspec.yaml retreival is for the package that is currently being indexed, this instead needs to be for the package of scip-dart instead. Might be worth checking on how args or other cli tools retrieve versions to determine how this can be done

[matthewnitschke-wk]

• https://stackoverflow.com/a/59508148 says you can retrieve the pubspec.yaml file via Platform.script.toFilePath(), but this does not work
  • if running the application directly via dart ./scip_dart.dart works fine, but once its compiled to the .snapshot file used by pub global activate the path points to scip_dart.snapshot which is not in the same directory as scip_dart's pubspec.yaml file
• webdev uses dwds/build_runner to populate a generated file with the version: https://sourcegraph.com/github.com/dart-lang/webdev/-/blob/dwds/test/build/ensure_version_test.dart?L14:22
• dcli uses pub_release (also by onepub) to also generate a version.g.dart file: https://pub.dev/packages/pub_release

The best solution might just be to have a version.dart file which is updated within CI in the release process