building from source should set roc version

[Anton-4]

If you build Roc from source and execute roc version you'll get the default value "built-from-source".
It would be nice to print some useful info:

For those without git changes we can print the last commit hash and date of the commit:

built from commit faeea52, with commit timestamp Fri Aug 23 09:02:06 UTC 2024

And with changes:

built from commit faeea52 with additional changes. Commit timestamp: Fri Aug 23 09:02:06 UTC 2024

[Hasnep]

I think I'd like to tackle this issue if nobody else has already started :)