fix: add ANTSRegistrator alias to fix import error

[Copilot]

from brainles_preprocessing.registration import ANTSRegistrator raised an ImportError because the class was only exported as ANTsRegistrator (lowercase s).

Changes

• brainles_preprocessing/registration/__init__.py: adds ANTSRegistrator = ANTsRegistrator alias inside the try block so both casings resolve correctly; if antspyx is not installed, neither name is available (existing behavior preserved)

from brainles_preprocessing.registration import ANTSRegistrator  # now works
from brainles_preprocessing.registration import ANTsRegistrator  # still works

• Fixes [BUG] cannot import ANTSRegistrator #188

[neuronflow]

Ah interesting the small S was created by autocomplete and led to the error message.

[Copilot]

Pull request overview

This PR fixes an import-casing mismatch in the registration package by adding an ANTSRegistrator alias for the existing ANTsRegistrator, eliminating an ImportError for users importing the all-caps variant.

Changes:

• Add ANTSRegistrator = ANTsRegistrator alias inside the existing try import block for the ANTs registrator.
• Preserve the existing optional-dependency behavior (when antspyx is missing, neither symbol is available).

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[MarcelRosier]

Why would we need this instead of just importing ANTsRegistrator? in case the name is wrong, just correct it rather than adding an alias

[neuronflow]

For some reason I don't fully understand yet, VSCode autocomplete leads to importing the wrong Caps version, which then leads to code crashes, but I agree, this is not really needed.

[neuronflow]

let's not merge, this but I am wondering what triggers this wrong code suggestion 🙃