fix: set default database connection pool size

[lizhanhui]

to #589

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[github-actions]

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It seems all right 👌

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[codecov]

Codecov Report

Merging #593 (449b87e) into main (52a7a0a) will decrease coverage by 0.01%.
The diff coverage is 14.28%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #593      +/-   ##
============================================
- Coverage     59.02%   59.01%   -0.01%     
+ Complexity     1909     1907       -2     
============================================
  Files           196      196              
  Lines         12811    12816       +5     
  Branches       1220     1220              
============================================
+ Hits           7562     7564       +2     
  Misses         4638     4638              
- Partials        611      614       +3     

Components	Coverage Δ
RocketMQ Broker	∅ <ø> (∅)
RocketMQ Common	12.96% <ø> (ø)
RocketMQ Controller	49.46% <ø> (+0.26%)	⬆️
RocketMQ Proxy	44.35% <ø> (ø)
RocketMQ Store	77.61% <0.00%> (-0.36%)	⬇️
RocketMQ Stream	60.58% <ø> (-0.04%)	⬇️
RocketMQ Metadata	17.64% <ø> (ø)

Files	Coverage Δ
...q/rocketmq/metadata/HikariCPDataSourceFactory.java	100.00% <100.00%> (ø)
...ava/com/automq/rocketmq/store/DataStoreFacade.java	0.00% <0.00%> (ø)

... and 5 files with indirect coverage changes