Update Device handling

[gviga]

This PR updates the device handling between modules, introducing more checks and to(device) convertion to geomfum objects.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 72.91667% with 26 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
geomfum/shape/point_cloud.py	7.14%	13 Missing ⚠️
geomfum/dataset/torch.py	0.00%	3 Missing ⚠️
geomfum/forward_functional_map.py	0.00%	3 Missing ⚠️
geomfum/convert.py	0.00%	2 Missing ⚠️
geomfum/shape/_base.py	88.88%	2 Missing ⚠️
geomfum/basis.py	88.88%	1 Missing ⚠️
geomfum/descriptor/learned.py	0.00%	1 Missing ⚠️
geomfum/wrap/diffusionnet.py	0.00%	1 Missing ⚠️

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