add the package version note in the file with metric results

[rayvburn]

To indicate with which software version the results were obtained

[rayvburn]

Alternatively, create an additional file with metadata.

[rayvburn]

Ref: https://answers.ros.org/question/231956/how-to-get-versions-in-packagexml-from-roscpp-codes/

https://stackoverflow.com/questions/51727566/how-to-make-git-commit-hash-available-in-c-code-without-needless-recompiling