Dual Mesh Construction

[aaronzedwick]

Closes #825

Overview

Constructs the dual mesh of a grid using face_centers and node_face_connectivity

Expected Usage

import uxarray as ux

grid_path = "/path/to/grid.nc"

grid = ux.open_grid(grid_path)

dual = grid.compute_dual()

PR Checklist

General

• [x] An issue is linked created and linked
• [x] Add appropriate labels
• [x] Filled out Overview and Expected Usage (if applicable) sections

Testing

• [x] Adequate tests are created if there is new functionality
• [x] Tests cover all possible logical paths in your function
• [x] Tests are not too basic (such as simply calling a function and nothing else)

Documentation

• [x] Docstrings have been added to all new functions
• [x] Docstrings have updated with any function changes
• [x] Internal functions have a preceding underscore (_) and have been added to docs/internal_api/index.rst
• [x] User functions have been added to docs/user_api/index.rst