Add organization name to list organization memberships (#1285)

## Description
Serialize and surface the organization name in the list organization
membership call. Addressing
https://github.com/workos/workos-node/issues/1284
## Documentation

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

```
[X] No
```

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