class_docstr: Determines the time between the first and last time value
      in seconds.
  
  Examples:
      >>> from datetime import datetime
      >>> first_last_time_delta = FirstLastTimeDelta()
      >>> first_last_time_delta([
      ...     datetime(2011, 4, 9, 10, 30, 0),
      ...     datetime(2011, 4, 9, 10, 30, 15),
      ...     datetime(2011, 4, 9, 10, 30, 35)])
      35.0
code: def get_function(self):
      def first_last_time_delta(datetime_col):
          datetime_col = datetime_col.dropna()
          if datetime_col.empty:
              return np.nan
          delta = datetime_col.iloc[-1] - datetime_col.iloc[0]
          return delta.total_seconds()
  
      return first_last_time_delta
  
imports: import numpy
  from woodwork.column_schema import ColumnSchema
  from woodwork.logical_types import Datetime, Double
  from featuretools.primitives.base import AggregationPrimitive
label_desc: Use image node_id 1 for calling the FirstLastTimeDelta obj's underlying member method code with example usage: obj.get_function() and returns: first_last_time_delta, delta, np