↔ [Converter] Add support for `aten.matmul` in the FX `aten` path

[gs-olive]

aten.matmul

• Function Schema: torch.ops.aten.matmul: ((torch.float32, torch.float32), {})

• Original PyTorch API: torch.matmul

• Relevant TensorRT Documentation: IMatrixMultiplyLayer

Add support for matmul as an aten converter.

[github-actions]

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