Executor 2.0: Graph lowering

[mzient]

Category:

New feature (non-breaking change which adds functionality)

Description:

Graph lowering takes an abstract graph definition (graph::OpGraph) and converts it to the execution-level "lowered" graph. The lowering is done by traversing the "definition" graph and replicating its structure.

This PR also introduces more complex tests, where a complete pipeline is defined as an graph::OpGraph, lowered and executed.

Additional information:

Affected modules and functionalities:

None; new functionality.

Key points relevant for the review:

Tests:

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

Checklist

Documentation

• [ ] Existing documentation applies
• [X] Documentation updated
  • [ ] Docstring
  • [X] Doxygen
  • [ ] RST
  • [ ] Jupyter
  • [ ] Other
• [ ] N/A

DALI team only

Requirements

• [ ] Implements new requirements
• [ ] Affects existing requirements
• [X] N/A

REQ IDs: N/A

JIRA TASK: DALI-4030

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