Print the commit when running damon --version

It would be really useful to include the commit short sha when printing version information, especially while damon is still early in development. This would help with completing bug reports but would also make it easier to understand if a rebuild and install worked.

Thanks!

Start at the damon --version command and trace how version information is assembled. The work is done when version output includes the commit short SHA, helping users distinguish builds and report the exact revision.

Written by the indexing model from the issue text.