Describe your change

Replaces the common::get_version util function with the PKG_VERSION variables extracted from shadow_rs.

If you know of any other opportunities where we can replace things from shadow_rs, we can add them in this PR as wel..

Motivation and context

shadow_rs makes the old function redundant

Checklist

• The change come with new or modified tests
• Hard-to-understand functions have explanatory comments
• End-user documentation is updated to reflect the change