Bed zone heating support
Please add support for zoned heating on print beds that support it. For example, on the Snapmaker Artisan, there's an inner 260x260 zone which is heated by the "M140 P0 Sxx" (or "M190 P0 Sxx") command whereas the whole bed can be heated using "M140 P1 Sxx" (or "M190 P1 Sxx").
