Nvidia integration

[silvanocerza]

Checklist

If the request is accepted, ensure the following checklist is complete before closing this issue.

### Tasks
- [x] The code is documented with docstrings and was merged in the `main` branch
- [x] Docs are published at https://docs.haystack.deepset.ai/
- [x] There is a Github workflow running the tests for the integration nightly and at every PR
- [x] A label named like `integration:<your integration name>` has been added to this repo
- [x] The [labeler.yml](https://github.com/deepset-ai/haystack-core-integrations/blob/main/.github/labeler.yml) file has been updated
- [x] The package has been released on PyPI
- [ ] https://github.com/deepset-ai/haystack-core-integrations/issues/560
- [x] The integration has been listed in the [Inventory section](https://github.com/deepset-ai/haystack-core-integrations#inventory) of this repo README
- [x] There is an example available to demonstrate the feature
- [ ] The feature was announced through social media