Revert "Memory lock in raft"

[liuyu85cn]

Reverts #3926

[codecov-commenter]

Codecov Report

Merging #4202 (0b66a37) into master (4112c7d) will increase coverage by 0.06%.
The diff coverage is 87.52%.

@@            Coverage Diff             @@
##           master    #4202      +/-   ##
==========================================
+ Coverage   84.91%   84.97%   +0.06%     
==========================================
  Files        1321     1323       +2     
  Lines      131235   131195      -40     
==========================================
+ Hits       111434   111479      +45     
+ Misses      19801    19716      -85     

Impacted Files	Coverage Δ
src/graph/planner/match/MatchClausePlanner.h	100.00% <ø> (ø)
src/graph/scheduler/Scheduler.h	100.00% <ø> (ø)
src/graph/validator/MatchValidator.h	100.00% <ø> (ø)
src/kvstore/Common.h	82.17% <ø> (ø)
src/kvstore/KVStore.h	50.00% <ø> (ø)
src/kvstore/NebulaStore.cpp	67.99% <ø> (ø)
src/kvstore/NebulaStore.h	78.57% <ø> (ø)
src/kvstore/Part.h	100.00% <ø> (ø)
src/kvstore/raftex/test/RaftexTestBase.cpp	91.52% <ø> (-0.24%)	⬇️
src/kvstore/raftex/test/TestShard.cpp	76.12% <ø> (-0.31%)	⬇️
... and 71 more

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