Add support to big-ann ground truth file format

[VijayanB]

Description

Bigann stores ground truth in different format than vector dataset. In this commit, added new dataset that is used by big-ann for ground truth.

Issues Resolved

#530

Testing

• [x] New functionality includes testing

[Describe how this change was tested]

• make test
• Locally tested with bigann neighbor dataset as input and verified that recall is 0.998

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[VijayanB]

@IanHoang Can i get review for this PR? Thanks