doc: Add doc for new feature processor APIs and classes (#4250)

Author: can-sun

doc/api/prep_data/feature_store.rst

@@ -60,6 +60,7 @@ Feature Definition
     :members:
     :show-inheritance:
 
+
 Inputs
 ******
 
@@ -181,9 +182,13 @@ Feature Processor Data Source
     :members:
     :show-inheritance:
 
+.. autoclass:: sagemaker.feature_store.feature_processor.PySparkDataSource
+    :members:
+    :show-inheritance:
 
-Feature Processor Scheduler
-***************************
+
+Feature Processor Scheduler and Triggers
+****************************************
 
 .. automethod:: sagemaker.feature_store.feature_processor.to_pipeline
 
@@ -196,3 +201,12 @@ Feature Processor Scheduler
 .. automethod:: sagemaker.feature_store.feature_processor.describe
 
 .. automethod:: sagemaker.feature_store.feature_processor.list_pipelines
+
+.. automethod:: sagemaker.feature_store.feature_processor.put_trigger
+
+.. automethod:: sagemaker.feature_store.feature_processor.enable_trigger
+
+.. automethod:: sagemaker.feature_store.feature_processor.disable_trigger
+
+.. automethod:: sagemaker.feature_store.feature_processor.delete_trigger
+