Netcdf monitor compatible with gpu backend

[elynnwu]

Purpose

The first pass of netcdf monitor did not work for gpu backend, this PR fixes the issue.

Code changes:

• netcdf_monitor: use to_numpy whenever .view is referenced. When quantity.data_array is called, make DataArray from quantity directly.
• zarr_monitor: factor try except statement to to_numpy to be used for both zarr and netcdf
• convert: new function to_numpy added

Checklist

Before submitting this PR, please make sure:

• You have followed the coding standards guidelines established at Code Review Checklist.
• Docstrings and type hints are added to new and updated routines, as appropriate
• All relevant documentation has been updated or added (e.g. README, CONTRIBUTING docs)
• For each public change and fix in pace-util, HISTORY has been updated
• Unit tests are added or updated for non-stencil code changes

[mcgibbon]

LGTM, thanks!