[Feature] Add selected_out_keys to ProbabilisticTensorDictSequential.

[tobiabir]

Description

Describe your changes in detail.

• Added the selected_out_keys argument to the __init__ of ProbabilisticTensorDictSequential and pass it through to the parent TensorDictSequential.
• Added two tests testing that argument and intended functionality.

Motivation and Context

Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.
You can use the syntax close #15213 if this solves the issue #15213

close #1496

• I have raised an issue to propose this change (required for new features and bug fixes)

Types of changes

What types of changes does your code introduce? Remove all that do not apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds core functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)
• Example (update in the folder of examples)

Checklist

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• I have read the CONTRIBUTION guide (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.

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