[ResourceBundle] Multiple object managers support

| Q             | A
| ------------- | ---
| Bug fix?      | [no]
| New feature?  | [yes]
| BC breaks?    | [no]
| Deprecations? | [no]
| Tests pass?   | [yes]
| Fixed tickets | []
| License       | MIT
| Doc PR        | []

Configuration example:
 ```yml
bundle_name:
    driver: doctrine/orm
    object_manager: reference
```