crutcher / bimm / #178

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feat: add model weight caching and support for loading pretrained ResNet weights

- Introduced `cache` module with `fetch_model_weights` function for caching and downloading model weights.
- Enabled loading pretrained weights in ResNet models with new `with_classes` method.
- Updated `resnet_tiny` example to support pretrained weights and re-initialize output layers for customized class counts.
- Replaced `SGD` optimizer with `Adam` for enhanced training performance.
- Simplified `resnet_pretrained` example by reusing `cache::fetch_model_weights` implementation.
- Added dependency on `dirs` for handling cache directories.

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