Make `shape` instead of `store` parameter in useStoreMap

[xaota]

Proposal

const data = useStoreMap({
  shape: [$a, $b], // ! now: `store: combine([$a, $b])`
  keys: deps,
  fn: ([a, b], deps) => ...
});

https://t.me/effector_ru/279338

Use case

sometimes you need more than one store in useStoreMap hook

[igorkamyshev]

I assume it would be better to support shapes in store field instead of renaming it for this case 🤔