Feature improve regression tests (#6245)

* add data count properties

* 'add history count property

* assert data counts

* update missing override

* consider override/virtual cases

* implement data count

* add message handler for regression tests

* use regression test message handler

* set algorithm manager for regression test message handler

* update data count

* check if stats are present, check if algo manager is not null

* update

* add c# algo

* make same as c# algo

* use new line

* logic shifted to RegressionTestMessageHandler

* cleanup

* auto cleanup

* skip non deterministic data count

* change data count

* use inheritance

* improve stats

* update couht

* add sma indicator to c# and customSMA to python

* call base method before executing further

* skip test

* revert to original

* add duplicate sma

* skip regression test

Algorithm.CSharp/CustomDataUsingMapFileRegressionAlgorithm.cs

@@ -116,6 +116,16 @@ namespace QuantConnect.Algorithm.CSharp
         /// </summary>
         public Language[] Languages { get; } = { Language.CSharp, Language.Python };
 
+        /// <summary>
+        /// Data Points count of all timeslices of algorithm
+        /// </summary>
+        public long DataPoints => 1667;
+
+        /// </summary>
+        /// Data Points count of the algorithm history
+        /// </summary>
+        public int AlgorithmHistoryDataPoints => 0;
+
         /// <summary>
         /// This is used by the regression test system to indicate what the expected statistics are from running the algorithm
         /// </summary>