dump: reduce memory when dump large directories from redis

[davies]

close #4455

[codecov]

Codecov Report

Attention: Patch coverage is 68.00000% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 55.34%. Comparing base (8634b3a) to head (f4d2ace).
Report is 3 commits behind head on main.

Files	Patch %	Lines
pkg/meta/redis.go	68.00%	7 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4481      +/-   ##
==========================================
- Coverage   55.39%   55.34%   -0.05%     
==========================================
  Files         157      157              
  Lines       41218    41230      +12     
==========================================
- Hits        22831    22820      -11     
- Misses      15858    15885      +27     
+ Partials     2529     2525       -4     

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