Adds ETF(...) to UniverseDefinitions (#5873)

* Adds ETF(...) to UniverseDefinitions

  * Adds ETF constituents universe framework regression algorithm
    for C#/Python

* Address review: adds test cases for ticker/Symbol ETF universe additions

  * Fixes bug where null Market would result in null dereference exception

* Address review: add missing Index tests

* Address review: don't hardcode market when creating constituent universe

  * Uses Brokerage Model's default markets collection to determine
    the market for the given security type

* Address review: restore QC500 and DollarVolume.Top(...)

  * Restores algorithms related to both helper universe
    definition methods

* Address review: remove copy to output directory for python algos

* Add example algorithms for ETF constituent universes using custom RSI alpha model

* Address review: adjust algorithm to use cache + algo RSI & clean up code

* Address review: make ETF Constituent RSI Alpha Model algo a regression test

* Address review: increase trade count and remove single trade logic

Algorithm.Python/QuantConnect.Algorithm.PythonTools.pyproj

@@ -43,7 +43,6 @@
     <Compile Include="CompositeRiskManagementModelFrameworkAlgorithm.py" />
     <Compile Include="ConfidenceWeightedFrameworkAlgorithm.py" />
     <Compile Include="ConsolidateRegressionAlgorithm.py" />
-    <Compile Include="ConstituentsQC500GeneratorAlgorithm.py" />
     <Compile Include="ConstituentsUniverseRegressionAlgorithm.py" />
     <Compile Include="ConvertToFrameworkAlgorithm.py" />
     <Compile Include="CustomBuyingPowerModelAlgorithm.py" />