Implement native aten::fractional_max_pool2d and aten::fractional_max_pool3d - Resolves #29696

[kkm121]

Details:

• Implemented aten::fractional_max_pool2d and aten::fractional_max_pool3d by translating Benjamin Graham's stochastic interval math into a precise OpenVINO subgraph.
• Integrated the new operations into OpenVINO’s PyTorch frontend (including FX variants).
• Added robust deterministic layer tests to verify stochastic parity and TopK index tie-breaking equivalence with PyTorch.

Tickets:

• Closes [Good First Issue]: Support aten::fractional_max_pool2d [Good First Issue]: Support aten::fractional_max_pool2d #29696
• Parent Issue: [Good First Issue]: Operation list to be supported [Good First Issue]: Operation list to be supported #28584

[kkm121]

@mvafin @PiotrKrzem, could you please review my PR whenever you have a moment? Thanks!