Direct ptycho visualize and rotation

[smribet]

What problem this PR addreseses

This PR makes direct and iterative ptycho more consistent by changing direct ptycho to degrees and adding a visualize function.

FWIW I did some testing yesterday, and I think the direction of aberrations is consistent between abTEM, direct, and iterative ptycho, but others should confirm as well.

What should the reviewer(s) do

Merge the code and provide feedback.

[gvarnavi]

Thanks Steph, looks good to me!

Note aberration axes still need to be specified in radians, but I think we should leave this to match abTEM.

# ground truth
known_aberration_coefs = {
    "C10": 200,
    "C12": 100,
    "phi12": np.deg2rad(11)
}
known_rotation_angle = -13

Updated tutorials to match: electronmicroscopy/quantem-tutorials#11

Feel free to merge both when ready.

[smribet]

I agree aberrations in radians makes sense. Thanks for the feedback @gvarnavi!