feat: SetArea for models or LoRAs

LoRA tends to have side effects.
For example, a fashion LoRA can affect the face or picture style, and so on.
To avoid this, there's an (A1111) extension [hako-mikan/sd-webui-lora-block-weight](https://github.com/hako-mikan/sd-webui-lora-block-weight), which limits the activation of layers selectively.
However this also has side effects and requires a lot of experiments to find a suitable combination.
**Ideally, I think the best possible idea would be enabling SetArea for models and LoRAs, like conditioning.**
(Not block weight)
So for instance, fashion LoRA can be only applied to body, not face.
How do you think?
Is this technically possible?
Thanks :)