Extend usage of interpolation_mode to MAnet / UnetPlusPlus / FPN and align PAN

[GuillaumeErhard]

Closes #1104

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
...egmentation_models_pytorch/decoders/fpn/decoder.py	93.42% <100.00%> (+0.08%)	⬆️
segmentation_models_pytorch/decoders/fpn/model.py	94.73% <ø> (ø)
...mentation_models_pytorch/decoders/manet/decoder.py	97.80% <100.00%> (+0.04%)	⬆️
...egmentation_models_pytorch/decoders/manet/model.py	90.90% <ø> (ø)
...egmentation_models_pytorch/decoders/pan/decoder.py	96.66% <100.00%> (ø)
segmentation_models_pytorch/decoders/pan/model.py	95.83% <100.00%> (+1.09%)	⬆️
segmentation_models_pytorch/decoders/unet/model.py	91.66% <ø> (ø)
...on_models_pytorch/decoders/unetplusplus/decoder.py	92.95% <100.00%> (+0.10%)	⬆️
...tion_models_pytorch/decoders/unetplusplus/model.py	88.00% <ø> (ø)

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[qubvel]

Thanks! Also refined a bit and added tests 🤗