Incremental SVD directly from file

[mrfh92]

As we meanwhile have functionality for loading slices from hdf5 and zarr, it makes sense to extend incremental SVD in the way that the slices being processed in incremental way are directly loaded from such a file.

use-case: you have a large data set which you do not want to load completely, but you load groups of columns (with split=0) to be processed incrementally by incremental SVD

[mrfh92]

This could fill IncrementalPCA.fit() from heat/decomposition/pca.py with life and requires corresponding adaptations in _isvd and isvd from heat/core/linalg/svd_tools.py.

My idea would be that the slices loaded at each step should have such shape that they allow for tall-skinny SVD.

[github-actions]

Branch features/1853-Incremental_SVD_directly_from_file created!

[github-actions]

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