Can't filter for vector indices in `describe_indices`

[wjones127]

I was trying to use describe_indices to find ANN indices for a column, but found they aren't returned. I found it was due to this line in index_matches_criteria():

lance/rust/lance/src/index/scalar.rs

Lines 464 to 467 in de393a2

	if index_details.is_vector() {
	// This method is only for finding matching scalar indexes today so reject any vector indexes
	return Ok(false);
	}

It would be nice if this could support vector indices.

[westonpace]

Yes, that would be a nice feature. I wasn't avoiding vector indices here, just didn't need to filter on them at the time and we didn't have any index details yet.