Push vFilter down.

[Shylock-Hg]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Sub job of #4122

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 #4260 (9c15c59) into master (fba3b18) will increase coverage by 0.01%.
The diff coverage is 81.48%.

@@            Coverage Diff             @@
##           master    #4260      +/-   ##
==========================================
+ Coverage   84.92%   84.93%   +0.01%     
==========================================
  Files        1328     1329       +1     
  Lines      131930   132015      +85     
==========================================
+ Hits       112045   112133      +88     
+ Misses      19885    19882       -3     

Impacted Files	Coverage Δ
...optimizer/rule/PushVFilterDownScanVerticesRule.cpp	79.45% <65.38%> (-9.62%)	⬇️
src/graph/planner/match/MatchSolver.cpp	49.47% <66.66%> (+0.01%)	⬆️
src/graph/planner/plan/Query.cpp	70.32% <75.00%> (+2.14%)	⬆️
...rc/graph/optimizer/rule/PushFilterDownNodeRule.cpp	87.09% <87.09%> (ø)
src/graph/executor/query/TraverseExecutor.cpp	95.29% <100.00%> (ø)
src/graph/planner/plan/Query.h	96.26% <100.00%> (+0.04%)	⬆️
src/graph/visitor/ExtractFilterExprVisitor.cpp	71.25% <100.00%> (+0.22%)	⬆️
src/meta/processors/parts/GetSpaceProcessor.cpp	61.29% <0.00%> (-19.36%)	⬇️
src/kvstore/raftex/Host.cpp	71.70% <0.00%> (-3.86%)	⬇️
src/storage/mutate/AddVerticesProcessor.cpp	84.18% <0.00%> (-3.85%)	⬇️
... and 35 more

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[CPWstatic]

LGTM. I prefer we had more comments, especially the rule matching part.