add volg to init.nc and add a new stream property gattr_update to turn on/off the update of global attributes

[guoqing-noaa]

No description provided.

[Copilot]

Pull Request Overview

This PR adds a new stream property gattr_update that allows users to control whether global attributes are updated during stream output operations. The property defaults to "yes" (enabled) to maintain backward compatibility.

Key changes:

• Added gattr_update as a configurable stream property with "yes"/"no" values
• Modified the stream output logic to conditionally update global attributes based on this setting
• Updated the C/Fortran interface to pass the new property between language boundaries

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
xml_stream_parser.c	Parses gattr_update XML attribute and passes integer flag to stream manager
mpas_stream_manager_types.inc	Defines constants for the new MPAS_STREAM_PROPERTY_GATTR_UPDATE property
mpas_stream_manager.F	Implements gattr_update property throughout stream lifecycle and conditionally writes attributes
mpas_stream_list_types.inc	Adds gattr_update field to stream structure with default value of 1
Registry.xml	Adds new volg variable for graupel particle volume (unrelated to main PR purpose)

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}