Slideshow block: add crop, style/duotone controls

### Impacted plugin

None / Other

### What

Extend the slideshow image block toolbar

### How

Issue: there are controls on the Gallery block (crop, style/duotone) that aren’t available in Slideshow.

Task: add crop, style/duotone controls in the slideshow image block toolbar.

Start at the Slideshow image block toolbar and compare its available controls with the Gallery block toolbar, as described in the issue. The work is done when Slideshow exposes crop and style/duotone controls alongside its existing toolbar options; the issue does not name specific files or tests.

Written by the indexing model from the issue text.