enhance: Use RWMutex and change WLock to RLock

[congqixia]

Related to #27675

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (98adbb3) 80.23% compared to head (33e329b) 80.23%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #30557      +/-   ##
==========================================
- Coverage   80.23%   80.23%   -0.01%     
==========================================
  Files         965      965              
  Lines      136070   136070              
==========================================
- Hits       109180   109177       -3     
  Misses      23171    23171              
- Partials     3719     3722       +3     

Files	Coverage Δ
internal/datanode/metacache/bloom_filter_set.go	92.00% <100.00%> (ø)

... and 17 files with indirect coverage changes

[congqixia]

/approve

[XuanYang-cn]

/lgtm
/approve

[sre-ci-robot]

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