🚀 Feature: Add SpeciesNet classification model implementation

[letho1608]

Problem

Introduce a new SpeciesNet model that follows the same interface as the other classification models in the library. The model will be a thin PyTorch wrapper around a ResNet‑50 backbone (using timm) with a custom classification head that matches the expected number of classes. The implementation inherits from the existing BaseClassifier so it can be used interchangeably with the other models (e.g., Amazon, Serengeti) throughout the Pytorch‑Wildlife code‑base.

Severity: medium
File: PytorchWildlife/models/classification/speciesnet.py

Solution

Implemented the necessary changes to address the identified issue in PytorchWildlife/models/classification/speciesnet.py.

Changes

• PytorchWildlife/models/classification/speciesnet.py (new)
• PytorchWildlife/models/classification/__init__.py (modified)

Testing

• Existing tests pass
• Manual review completed
• No new warnings/errors introduced

Closes #597

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