Experimental: remove squeezing from C API

[mzient]

Category:

Bug fix (non-breaking change which fixes an issue)
Breaking change (fix or feature that would cause existing functionality to not work as expected)
Refactoring (Redesign of existing code that doesn't affect functionality)

Description:

This PR removes the feature of squeezing the innermost dimension in C API.

1. We didn't use it in TF for dense tensors (and sparse tensors weren't even tested until very recently)
2. It can easily break by coincidence
3. It was already broken for scalar outputs and we didn't even notice.

Formally it's a breaking change, affecting sparse tensors in TF plugin (which we don't really care about) and Triton (where we don't really process data that would undergo this squeeze).

Additional information:

Affected modules and functionalities:

Key points relevant for the review:

Tests:

Tensorflow tests

• 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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