perf(s3stream): speedup wal recovery

[Chillax-0v0]

resolve AutoMQ/automq#573

On AWS EBS gp3 (3000 IOPS, 125 MB/s):
Recover 65536 messages (16 KiB each, 1 GiB in total) cost 92.7s -> 15.3s
Recover 65536 messages (4 KiB each, 256 MiB in total) cost 65.8s -> 2.5s

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (db7af3a) 55.94% compared to head (4f26fba) 55.92%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #910      +/-   ##
============================================
- Coverage     55.94%   55.92%   -0.02%     
  Complexity     1268     1268              
============================================
  Files           133      133              
  Lines          8534     8534              
  Branches        789      789              
============================================
- Hits           4774     4773       -1     
  Misses         3327     3327              
- Partials        433      434       +1     

Components	Coverage Δ
RocketMQ Broker	∅ <ø> (∅)
RocketMQ Common	5.80% <ø> (ø)
RocketMQ Controller	57.39% <ø> (ø)
RocketMQ Proxy	37.28% <ø> (ø)
RocketMQ Store	73.60% <ø> (-0.05%)	⬇️
RocketMQ Stream	∅ <ø> (∅)
RocketMQ Metadata	35.44% <ø> (ø)

see 1 file with indirect coverage changes