add: linear search implementation (+ benchmarks)#1

dhartunian merged 1 commit intov1.16.0-crdb-changescockroachdb/client_golang:v1.16.0-crdb-changesfrom

open-up-histogram-api-1.16.0-apply-perf-improvementcockroachdb/client_golang:open-up-histogram-api-1.16.0-apply-perf-improvementCopy head branch name to clipboard