Support loading from storage blob in query library

[natoverse]

Do you need to file an issue?

• [X] I have searched the existing issues and this feature is not already filed.
• [X] My model is hosted on OpenAI or Azure. If not, please look at the "model providers" issue and don't file a new one here.
• [X] I believe this is a legitimate feature request, not just a question. If this is a question, please use the Discussions area.

Is your feature request related to a problem? Please describe.

We have received reports of issues with blob storage (for example https://github.com/microsoft/graphrag/issues/789). It turns out that we had not yet migrated the blob loading used by the indexer into the query portion at all, so this just fails. Filing this as a "missing feature".

Describe the solution you'd like

No response

Additional context

No response