[SFC Playground Feature request]: Support auto format on save

[shezhangzhang]

What problem does this feature solve?

I really like to use the sfc playground to show some vue demo. Does it support auto format on save?

What does the proposed API look like?

Support auto format on save

[sxzz]

The official playground is not supported, but you can try Element Plus playground. Try Ctrl / ⌥ + Shift + F.