Write out namelist parameters at initialization using generated namelist read code

### What is the feature/what would you like to discuss?

This issue arose during updates to ZM in Hack shallow convection CCPPization: https://github.com/ESCOMP/atmospheric_physics/pull/195

@cacraigucar wrote:
> Should these writes become part of the namelist generated code (a future issue)? It feels like it is too easy for the informational writes to get out-of-sync with the namelist generated code. As for the missing fields, it makes sense to have the namelist variables written out.

### Is there anyone in particular you want to be part of this conversation?

@cacraigucar @nusbaume @peverwhee

### Will this change (regression test) answers?

No

### Will you be implementing this enhancement yourself?

Any Software Engineer can do this