feat: remove field RequestStats.read_efficiency_stats
feat: rename proto AllReadStats to FullReadStatsView
feat: rename field RequestStats.all_read_stats to full_read_stats_view
feat: rename proto ReadIteratorStats to ReadIterationStats
feat: remove enum value ReadRowsRequest.RequestStatsView.REQUEST_STATS_EFFICIENCY
feat: remove field ReadIterationStats.deletes_seen
PiperOrigin-RevId: 479370243