fix issue in fusedL2knn which happens when rows are multiple of 256 #604
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This PR fixes issue - #568 and rapidsai/cuml#4624
-- fix issue in fusedL2knn which happens when rows are multiple of 256.
-- make index value to be size_t to avoid int overflow though this doesn't hamper these issues but it may for higher input sizes.
-- also add some additional test cases in fusedL2knn test.