`PipeOpTorch`: Add adaptive average pooling from torch

[sebffischer]

Implement: https://torch.mlverse.org/docs/reference/torch_adaptive_avg_pool1d.html?q=adaptive#null for 1d, 2d and 3d.

This is similar to: https://github.com/mlr-org/mlr3torch/blob/main/R/PipeOpTorchAvgPool.R