add monitoring for vertexing in physmon

[andiwand]

we have vertexing as part of the odd full chain now in ´full_chain_odd.py´ but no monitoring in physmon.py

see discussion here https://github.com/acts-project/acts/pull/1299

[paulgessinger]

I'm working on this.

[stale[bot]]

This issue/PR has been automatically marked as stale because it has not had recent activity. The stale label will be removed if any interaction occurs.

[AJPfleger]

This should have been added with

• https://github.com/acts-project/acts/pull/1417