Add operator `select` which selects a sample from one of the inputs

[mzient]

Signed-off-by: Michał Zientkiewicz [email protected]

Why we need this PR?

Pick one, remove the rest

• It adds new feature needed for sample masking/selection/conditional execution

What happened in this PR?

Fill relevant points, put NA otherwise. Replace anything inside []

• What solution was applied:
  • A simple operator which just copies one of the inputs to the output
• Affected modules and functionalities:
  • None (it's a new code)
• Key points relevant for the review:
  • N/A
• Validation and testing:
  • Python unit tests for success
  • Python unit tests for errors
  • Local tests with Valgrind
• Documentation (including examples):
  • Docstrings

JIRA TASK: DALI-2202

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