Add thread_setup callback to tasking::Executor

[mzient]

Category:

New feature (non-breaking change which adds functionality)

Description:

This change adds a callback that's called in each tasking::Executor thread prior to the main loop. It can be used to setup thread-local environment, like working directory or CUDA context.

Additional information:

Affected modules and functionalities:

Key points relevant for the review:

Tests:

• Existing tests apply
• New tests added
  • Python tests
  • GTests
  • Benchmark
  • Other
• N/A

Checklist

Documentation

• Existing documentation applies
• Documentation updated
  • Docstring
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DALI team only

Requirements

• Implements new requirements
• Affects existing requirements
• N/A

REQ IDs: N/A

JIRA TASK: N/A

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