Add initial version of auto estimator (intel-analytics#3731)

* add initial version of auto estimator

* support str for torch optimizor and loss

* move create searcher

* change name to model_builder

* add best model

* add convert probability to class in metrics.Accuracy

* change condition order

* add pytorch ut

* change util name

* add LR_NAME

* add document for LR_NAME

* add check with best model and optimizer class test

* add ut for tf.keras

* move tests to orca/automl/autoestimator/

* change name

* add auto test

* fix pep8

* remove return in fit

* add raise error for fit multiple times

* remove optimizer class

* fix bug

* change error message

python/orca/src/test/dev/run-pytests-ray

@@ -79,3 +79,13 @@ then
 fi
 
 ray stop -f
+
+echo "Running orca auto estimator tests"
+python -m pytest -v ../test/zoo/orca/automl/autoestimator
+exit_status_6=$?
+if [ $exit_status_6 -ne 0 ];
+then
+    exit $exit_status_6
+fi
+
+ray stop -f