Add verbosity control to `ve_run_cli`

**Is your feature request related to a problem? Please describe.**

Although we haven't sorted out systematic logging levels yet, at the moment we can't control what logging detail is output to the log.

**Describe the solution you'd like**

Basically all we need is a new parser argument that set the logger level along the DEBUG ... CRITICAL chain.

Start at the ve_run_cli entry point and its argument parser. Add a parser option that controls the logger level across the DEBUG-to-CRITICAL range, then verify that the selected verbosity changes the log output.

Written by the indexing model from the issue text.