Adds additional common netCDF coordinates

[JamesVarndell]

Adds a few more common geographic coordinates found frequently in netCDF data - namely:

• "X" and "Y" (capital X and Y)
• "xc" and "yc"

These additional geographic coordinates make it easier to work with datasets which use these coordinate names. These additional coordinates have been selected based on their use within some CDS datasets.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.78%. Comparing base (d5c6309) to head (6284f53).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #398   +/-   ##
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  Coverage    89.78%   89.78%           
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  Files          120      120           
  Lines         7653     7653           
  Branches       675      675           
========================================
  Hits          6871     6871           
  Misses         651      651           
  Partials       131      131           

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