new_contents: class Import:
      """Benchmark importing xarray"""
  
      def timeraw_import_xarray(self):
          return """
          import xarray
          """
  
      def timeraw_import_xarray_plot(self):
          return """
          import xarray.plot
          """
  
      def timeraw_import_xarray_backends(self):
          return """
          from xarray.backends import list_engines
          list_engines()
          """
  
subject: Add import ASV benchmark (#7176)