Bitmaps (at least, SVGs) do not rotate in a `context(..., rotation=Rotation(θ)`

I'm not sure if this is intentional (or just unsupported for technical reasons), but I found that `bitmap(["image/svg+xml"], ...)` isn't rotated even when part of the appropriate context.

I can provide a MRE if needed, but otherwise, let me know how I can make this issue better for sorting this out. 🙂