Function useLock

useLock(): [isLocked: boolean, acquire: () => Promise<() => void>]
Promise-based lock implementation.

When someone tries to acquire a lock using acquire they receive a promise for a release callback that is fulfilled as soon as previous lock owner invokes their release callback. If acquire is called after unmount then the returned promise is never fulfilled.

Returns [isLocked: boolean, acquire: () => Promise<() => void>]
Example
```
const [locked, acquire] = useLock();

async function doSomething() {
  const release = await acquire();
  try {
    // Long process starts here
  } finally {
    release();
  }
}

// Long process would be executed three times sequentially
doSomething();
doSomething();
doSomething();
```