fix: make dataset nodes ordering stable

[tristan-f-r]

This is the main change:

spras/spras/dataset.py

Lines 107 to 108 in a61bfce

	# We get uniqueness afterwards to make `load_files_from_dict` have a well-defined node ordering
	nodes = list(pd.concat([self.interactome.Interactor1, self.interactome.Interactor2]).unique())

Some algorithms depend on the ordering of their nodes, which is why this is marked as needed for benchmarking: we can guarantee immutable generated outputs this way. We never want interactome permutations, as they don't produce immutable output for some algorithms.

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This also adds tests to all inputs, closing #336.

This will be annoying to review. I have at least gone through and compared it with the regular input file to see that this looks right, but a thorough review of all of the test files will be unfortunately tedious.

[read-the-docs-community]

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