feat(s3stream): optimize cache performance by adding offset index

[superhx]

#690

[codecov]

Codecov Report

Merging #731 (4edb0ca) into main (fba58e9) will increase coverage by 0.01%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #731      +/-   ##
============================================
+ Coverage     57.44%   57.45%   +0.01%     
- Complexity     1222     1224       +2     
============================================
  Files           131      131              
  Lines          8029     8029              
  Branches        736      736              
============================================
+ Hits           4612     4613       +1     
  Misses         3020     3020              
+ Partials        397      396       -1     

Components	Coverage Δ
RocketMQ Broker	∅ <ø> (∅)
RocketMQ Common	5.80% <ø> (ø)
RocketMQ Controller	54.88% <ø> (ø)
RocketMQ Proxy	42.75% <ø> (ø)
RocketMQ Store	76.98% <ø> (+0.04%)	⬆️
RocketMQ Stream	∅ <ø> (∅)
RocketMQ Metadata	35.29% <ø> (ø)

see 1 file with indirect coverage changes