Using VerticalGrid::can_connect_to; added VerticalGrid::is_identical_to

[pchakraborty]

Types of change(s)

• Bug fix (non-breaking change which fixes an issue)
• 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
• Ran the Unit Tests (make tests)

Description

• FieldSpec::adapt_vertical_grid now uses VerticalGrid::can_connect_to to verify that regridding is possible between src and dst vertical grids
• FieldSpec::adapter_match_vertical_grid now uses VerticalGrid::is_identical_to instead of the contained same_vertical_grid. This resolves the issue of circular dependency that prevented handling of ModelVerticalGrid in FieldSpec

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