feat(UI): add Inpaint Mask as drag & drop target on canvas#8942

Pfannkuchensack wants to merge 1 commit intoinvoke-ai:maininvoke-ai/InvokeAI:mainfrom

Pfannkuchensack:enhancement/drop_inpaint_maskPfannkuchensack/InvokeAI:enhancement/drop_inpaint_maskCopy head branch name to clipboard