Adding dataset_name argument to pipelines index() method

[gabrielspmoreira]

Description

This MR adds a dataset_name argument to pipelines index() method (rather than setting pipeline.dataset_name directly. The dataset_name information is useful for example for caching the embeddings for a given dataset. That change will make retrieval pipelines compatible with this PR at the official vidore-benchmark repo.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.
• If adjusting docker-compose.yaml environment variables have you ensured those are mimicked in the Helm values.yaml file.