Add PyObject overload to ETFConstituentsUniverseSelectionModel

[DerekMelchin]

Description

Add PyObject overload to ETFConstituentsUniverseSelectionModel

Related Issue

#6562

Motivation and Context

So we can use the C# implementation of the model in a Python algorithm.

Requires Documentation Change

Yes, remove

from Selection.ETFConstituentsUniverseSelectionModel import ETFConstituentsUniverseSelectionModel

from Add ETF Constituents Universe Selection.

How Has This Been Tested?

N/A

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] Refactor (non-breaking change which improves implementation)
• [ ] Performance (non-breaking change which improves performance. Please add associated performance test and results)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Non-functional change (xml comments/documentation/etc)

Checklist:

• [x] My code follows the code style of this project.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.
• [x] My branch follows the naming convention bug-<issue#>-<description> or feature-<issue#>-<description>