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sparse vectors may have arbitrary number of non zeros and it is hard to optimize without knowing the actual distribution of nnz. this PR adds a metric for analyzing that. issue: https://github.com/milvus-io/milvus/issues/35853 comparing with https://github.com/milvus-io/milvus/pull/38328, this includes also metric for FTS in query node delegator also fixed a bug of sparse when searching by pk Signed-off-by: Buqian Zheng <zhengbuqian@gmail.com>