Return TensorLayout by const-reference.

[mzient]

Category:

Refactoring (Redesign of existing code that doesn't affect functionality)

Description:

To facilitate representation of the TensorLayout in C API as a simple const char *, the layout query functions in TensorList should return a pointer to a persistent storage. In this case, we can simply return the c_str() of the TensorLayout stored inside a Tensor(List).

Additional information:

Affected modules and functionalities:

All and nothing :) This is a small change and should not affect client code, but cases a massive rebuild.

Key points relevant for the review:

Tests:

All tests that use layouts - which is pretty much everything in Python and lots of GTests.

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

Checklist

Documentation

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

DALI team only

Requirements

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

REQ IDs: N/A

JIRA TASK: N/A

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