Add result selector support for GlueDataBrewStartJobRunStep

Author: Daniel Yoo

src/stepfunctions/steps/service.py

@@ -240,6 +240,7 @@ def __init__(self, state_id, wait_for_completion=True, **kwargs):
             heartbeat_seconds_path (str, optional): Path specifying the state's heartbeat value in seconds from the state input. When resolved, the path must select a field whose value is a positive integer.
             input_path (str, optional): Path applied to the state’s raw input to select some or all of it; that selection is used by the state. (default: '$')
             parameters (dict, optional): The value of this field becomes the effective input for the state.
+            result_selector (dict, optional): The value of this field becomes the effective result of the state.
             result_path (str, optional): Path specifying the raw input’s combination with or replacement by the state’s result. (default: '$')
             output_path (str, optional): Path applied to the state’s output after the application of `result_path`, producing the effective output which serves as the raw input for the next state. (default: '$')
             wait_for_completion (bool, optional): Boolean value set to `True` if the Task state should wait to complete before proceeding to the next step in the workflow. (default: True)