Add api key events (#1437)

## Description

Adds support for recently added api key events: `api_key.created` and
`api_key.deleted`

## Documentation

Does this require changes to the WorkOS Docs? E.g. the [API
Reference](https://workos.com/docs/reference) or code snippets need
updates.

```
[ ] Yes
```

If yes, link a related docs PR and add a docs maintainer as a reviewer.
Their approval is required.