need better defaults for autogenerate_ds

I just tried out autogenerate_ds.

I loaded the dataset in this example.

The dataset has the following coords:

<xarray.Dataset>
Dimensions:                      (lat: 180, lon: 360, time: 203)
Coordinates:
  * lon                          (lon) float32 0.5 1.5 2.5 3.5 4.5 5.5 6.5 ...
  * time                         (time) datetime64[ns] 2000-03-15 2000-04-15 ...
  * lat                          (lat) float32 -89.5 -88.5 -87.5 -86.5 -85.5 ...

I tried the following

grid_ds = xgcm.autogenerate.generate_grid_ds(ds, axes_dims_dict={'X': 'lon', 'Y': 'lat'})

But I got and error RuntimeError: Either "boundary_discontinuity" or "pad" have to be specified.

I repeated with

grid_ds = xgcm.autogenerate.generate_grid_ds(ds, axes_dims_dict={'X': 'lon', 'Y': 'lat'},
                                            boundary_discontinuity={'lon': 360, 'lat': 180})

I understand why I need this option, but it feels a too complicated. Maybe we can think about some different default values or behaviors that avoid having to specify the boundary_discontinuity keyword in these simple cases.

cc @jbusecke

[rabernat]

Sorry, my bad! I lost track of that PR. Will review now.

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