[SDK] Set small initial value for AttributesHashMap::hash_map_#3391

ThomsonTan wants to merge 4 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-cpp:mainfrom

ThomsonTan:set_bucket_count_for_hash_mapThomsonTan/opentelemetry-cpp:set_bucket_count_for_hash_mapCopy head branch name to clipboard