[MO] Support TF2 Keras ConvLSTM2D operation

[rkazants]

Description: it implements support of TF2 Keras ConvLSTM2D by the MO tool and adds transformation for pulling constant nodes into a body graph of Loop node. Inference results match.

Ticket: 47278

Code:

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

Validation:

• Unit tests - we have a separate testing activity
• Framework operation tests - we have a separate testing activity
• Transformation tests - we have a separate testing activity
• e2e model test with an update of ./tests/e2e_oss/utils/reshape_utils.py - N/A, no model
• Model Optimizer IR Reader check

Documentation:

• Supported frameworks operations list - we have a separate documentation activity
• Supported public models list - N/A
• New operations specification - N/A
• Guide on how to convert the public model - N/A
• User guide update - N/A

Signed-off-by: Roman Kazantsev [email protected]