StateItemSpec overload write

[pchakraborty]

Types of change(s)

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Trivial change (affects only documentation or cleanup)
• [ ] Refactor (no functional changes, no api changes)

Checklist

• [ ] Tested this change with a run of GEOSgcm
• [x] Ran the Unit Tests (make tests)

Description

Overload write for StateItemSpec. Very helpful for debugging.

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