GetNeighborsIter could get size now.

[Shylock-Hg]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Description:

How do you solve it?

Special notes for your reviewer, ex. impact of this fix, design document, etc:

Checklist:

Tests:

• Unit test(positive and negative cases)
• Function test
• Performance test
• N/A

Affects:

• Documentation affected (Please add the label if documentation needs to be modified.)
• Incompatibility (If it breaks the compatibility, please describe it and add the label.）
• If it's needed to cherry-pick (If cherry-pick to some branches is required, please label the destination version(s).)
• Performance impacted: Consumes more CPU/Memory

Release notes:

Please confirm whether to be reflected in release notes and how to describe:

ex. Fixed the bug .....

[codecov-commenter]

Codecov Report

Merging #4240 (cca71c6) into master (1fd89af) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4240      +/-   ##
==========================================
+ Coverage   84.89%   84.96%   +0.07%     
==========================================
  Files        1326     1326              
  Lines      131806   131803       -3     
==========================================
+ Hits       111892   111991      +99     
+ Misses      19914    19812     -102     

Impacted Files	Coverage Δ
src/graph/executor/Executor.cpp	81.23% <100.00%> (+0.51%)	⬆️
src/graph/executor/StorageAccessExecutor.cpp	100.00% <100.00%> (ø)
src/graph/executor/query/ProjectExecutor.cpp	100.00% <100.00%> (ø)
src/graph/executor/query/GetPropExecutor.h	82.35% <0.00%> (-5.89%)	⬇️
src/kvstore/raftex/Host.cpp	72.34% <0.00%> (-3.22%)	⬇️
src/graph/executor/StorageAccessExecutor.h	62.22% <0.00%> (-2.23%)	⬇️
src/graph/optimizer/Optimizer.cpp	91.52% <0.00%> (-1.70%)	⬇️
src/codec/RowReaderWrapper.h	95.08% <0.00%> (-1.59%)	⬇️
src/common/network/NetworkUtils.cpp	80.89% <0.00%> (-0.57%)	⬇️
src/kvstore/Listener.cpp	78.52% <0.00%> (-0.36%)	⬇️
... and 31 more

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