Add batching by topic for published events

## About

Resolvers should be called with an array of events (due to batching of events).

> Note: Needs exploration to see if this is necessary and/or common practice

## Example

Before

```
{
// ...
resolve: (event) => {
console.log(event) // { topic: 'MY_TOPIC', payload: {} }
}
}
```

After

```
{
// ...
resolve: (events) => {
console.log(events) // [{ topic: 'MY_TOPIC', payload: {} }]
}
}
```