excaliburjs / Excalibur / 8273148986 / 1

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feat: Allow coroutine lifecycles + support thisArg + remove engine requirement (#2965)

This PR adds an optional `ex.coroutine` timing parameter as an option bag to schedule when they are updated

  ```typescript
  const result = ex.coroutine(engine, function * () {...}, { timing: 'postupdate' })
  ```

This PR also adds a way to set the `this` parameter for a generator

  ```typescript
  const result = ex.coroutine({myThis: 'value'}, engine, function * () {...})
  ```

Additionally this PR removes the requirement to pass engine if done so under an Excalibur lifecycle

```typescript
  const result = ex.coroutine(function * () {...});
```


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Co-authored-by: Matt Jennings <me@mattjennings.io>

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