[MO] move importlib-metadata into setup.py

[pavel-esir]

Root cause analysis: during requirements check MO was not handling and marker when sys_platform and python_version are specified simultaneously, e.g. importlib-metadata; python_version < "3.8" and sys_platform == "win32" and shows warning:

[ WARNING ] The version checker doesn't support environment marker combination and it will be 
ignored: python_version < "3.8" and sys_platform == "win32"

Solution: Moved importlib-metadata from requirements.txt into setup.py

Ticket: CVS-77062

Code:

• Comments
• Code style (PEP8)
• Transformation generates reshape-able IR
• Transformation preserves original framework node names
• Transformation preserves tensor names

Validation:

• Unit tests: added new cases, existing tests didn't broke
• n/a Framework operation tests - no new operations were added
• n/a Transformation tests - no new transformation were added
• n/a Model Optimizer IR Reader check

Documentation:

• n/a Supported frameworks operations list
• n/a Guide on how to convert the public model
• n/a User guide update

[rkazants]

Why do we need importlib-metadata in requirements.txt file? no other tools use it. I propose to remove it and this change is not needed at all

[pavel-esir]

Why do we need importlib-metadata in requirements.txt file? no other tools use it. I propose to remove it and this change is not needed at all

We need importlib-metadata for entry_points on windows. Without that package calling mo --input_model ... would not work.
It is needed only for windows and only if python version is < 3.7, on linux and py >= 3.8 entry_points work without this requirement.

We are willing to make this as default recommended path to use MO therefore we can not remove this from requirements. But if my changes look too risky we can make this package required for both windows and linux or/and for all versions of python. And close this PR. This should not cause any harm since the package is lightweight.

[rkazants]

@pavel-esir, please remove importlib-metadata from requirements.txt and leave it only in setup.py as we agreed. No other changes are needed.

[pavel-esir]

@pavel-esir, please remove importlib-metadata from requirements.txt and leave it only in setup.py as we agreed. No other changes are needed.

ok, i'll do this

[pavel-esir]

Moved importlib-metadata into setup.py, @rkazants please take a look

[andrei-kochin]

LGTM