multislice rPIE ready for main branch after testing Daniel's reworkng of multiGPU workflow

[a4894z]

Purpose

After extensive testing on various benchmarking datasets (experimental and simulated), I believe multislice rPIE is ready to be merged into the main branch of TIKE.

Approach

The preconditioners are calculated for each slice in the sample, and these are then used in the sample update for each slice in a 3PIE style of update and the probe is updated using only the first slice of the sample and probe...this is a similar scheme that fold_slice uses in their LSTSQ multislice solver.

Pre-Merge Checklists

Submitter

• Write a helpfully descriptive pull request title.
• Organize changes into logically grouped commits with descriptive commit messages.
• Document all new functions.
• Click 'details' on the readthedocs check to view the updated docs.
• Write tests for new functions or explain why they are not needed.
• Address any complaints from pep8speaks.

Reviewer

• Actually read all of the code.
• Run the new code yourself; the included tests should make this easy.
• Write a summary of the changes as you understand them.
• Thank the submitter.

[pep8speaks]

Hello @a4894z! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file src/tike/operators/cupy/fresnelspectprop.py:

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• In the file src/tike/operators/cupy/multislice.py:

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• In the file src/tike/operators/cupy/ptycho.py:

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• In the file src/tike/ptycho/ptycho.py:

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• In the file src/tike/ptycho/solvers/_preconditioner.py:

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• In the file src/tike/ptycho/solvers/rpie.py:

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