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The purpose of this MEP is to realize "range search" functionfunctionality. User specifies a " range " (scope -- including radius low bound , or and radius high bound, or both), Milvus does "range search" to get TOPK results with distance falling in this " range".
- only set radius low bound, return TOPK results with "low_bound <= distance"
- only set radius high bound, return TOPK results with "distance < high_bound". (These TOPK results returned by range search will be identical with the TOPK results returned by search.)
- set both radius low bound and high bound, return TOPK results with "low_bound <= distance < high_bound"
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