Make sure I/O Timings are correctly taken into account

[pgiraud]

In PG17, at least, I/O timings may be detailed (info for shared, temp, etc.)

I/O Timings: shared read=60857.349 write=2075.348, temp read=190561.144 write=20711.103

We should make sure this is correctly parsed and managed / shown.

Example plan: https://explain.dalibo.com/plan/40ed3a382gah1b44#plan

                                                                                       QUERY PLAN                                                                                       
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 MixedAggregate  (cost=0.72..61651817.79 rows=533341364 width=165) (actual time=0.040..1787528.803 rows=1600008002 loops=1)
   Output: count(*), avg(aid), avg(bid), aid, bid, filler
   Hash Key: pgbench_accounts.bid
   Hash Key: pgbench_accounts.bid, pgbench_accounts.filler
   Group Key: pgbench_accounts.aid, pgbench_accounts.bid, pgbench_accounts.filler
   Group Key: pgbench_accounts.aid, pgbench_accounts.bid
   Group Key: pgbench_accounts.aid
   Group Key: ()
   Sort Key: pgbench_accounts.filler, pgbench_accounts.aid
     Group Key: pgbench_accounts.filler, pgbench_accounts.aid
     Group Key: pgbench_accounts.filler
   Batches: 1  Memory Usage: 4505kB
   Buffers: shared hit=36161 read=7614118 written=389455, temp read=5039174 written=5039224
   I/O Timings: shared read=60857.349 write=2075.348, temp read=190561.144 write=20711.103
   ->  Incremental Sort  (cost=0.72..24654143.31 rows=133333355 width=93) (actual time=0.029..214525.022 rows=400000000 loops=1)
         Output: aid, bid, filler
         Sort Key: pgbench_accounts.aid, pgbench_accounts.bid, pgbench_accounts.filler
         Presorted Key: pgbench_accounts.aid
         Full-sort Groups: 12500000  Sort Method: quicksort  Average Memory: 28kB  Peak Memory: 28kB
         Buffers: shared hit=36160 read=7614118 written=389455
         I/O Timings: shared read=60857.349 write=2075.348
         ->  Index Scan using pgbench_accounts_pkey on public.pgbench_accounts  (cost=0.57..18654142.33 rows=133333355 width=93) (actual time=0.017..154112.353 rows=400000000 loops=1)
               Output: aid, bid, filler
               Filter: ((((3 * pgbench_accounts.aid) - (17 * pgbench_accounts.bid)) + 33) > 5)
               Buffers: shared hit=36160 read=7614118 written=389455
               I/O Timings: shared read=60857.349 write=2075.348
 Query Identifier: 7834501604919028676
 Planning:
   Memory: used=33kB  allocated=64kB
 Planning Time: 0.076 ms
 Execution Time: 1849934.115 ms

Related to #477 (comment)