Here I propose renaming the following methods to align with conventions adopted by xarray/pandas/pyarrow:

• Rename _GMT_DATASET.to_dataframe to .to_pandas.
• Rename _GMT_GRID.to_dataarray and _GMT_IMAGE.to_dataarray to .to_xarray

Reference:

• pandas.DataFrame.to_xarray
• pyarrow.Table.to_pandas
• xarray.DataArray.to_pandas

Since _GMT_DATASET/_GMT_GRID/_GMT_IMAGE are internal data structures, we can rename these functions without deprecation warnings. Of course, we can also go with the deprecation cycle if you think it's necessary.