include progress event

[pelikhan]

Would it be possible to include some progress info in this callback like current/total?

vectra/src/LocalDocumentIndex.ts

Line 260 in ebee3fc

response = await this._embeddings.createEmbeddings(batch);

[Stevenic]

@pelikhan do you want to create a draft PR and I'll take a look... I'm also happy to add some co-maintainers to the repo...