Commits on Jun 1, 2023

1. perf(metarepos): add mrpb.StorageNodeUncommitReport pool …

   This patch adds an `mrpb.StorageNodeUncommitReport` pool, which is
   `proto/mrpb.storageNodeUncommitReportPool`. It reduces heap objects allocated repeatedly whenever
   processing reports received from storage nodes.
   
   Below heap profiling is the previous result.
   
   ```
         flat  flat%   sum%        cum   cum%
     70865580  8.38% 44.73%   71293773  8.43%  github.com/kakao/varlog/internal/metarepos.(*reportCollectExecutor).processReport
   ```
   
   Now here it is after applying this patch.
   
   ```
         flat  flat%   sum%        cum   cum%
     20734504  2.10% 75.92%   42122814  4.26%  github.com/kakao/varlog/internal/metarepos.(*reportCollectExecutor).processReport
   ```

   

   ijsong committed Jun 1, 2023
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