Fix security issue with XML parsing

[mvafin]

Root cause analysis: xml.etree.ElementTree.parse is unsafe to use, xml.etree.ElementTree is unsafe to include.

Solution: Replace unsafe xml.etree.ElementTree.parse with safe defusedxml.ElementTree.parse. Use defusedxml.defuse_sdtlib() to patch xml.etree.ElementTree and use objects from patched library.

Ticket: 55711

Code:

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

Validation:

• Unit tests
• Framework operation tests: N/A - No new enabled operations;
• Transformation tests: N/A - No new implemented transformations;
• Model Optimizer IR Reader check: N/A

Documentation:

• Supported frameworks operations list: N/A - No new supported operations;
• Supported public models list: N/A - Nothing to add;
• User guide update: N/A - Nothing to update.

[rkazants]

@mvafin, @asomsiko, why should we care of this if the MO tool is offline tool? We can break something in MO by changing this logic that is more risky.