Add test cases match3/4 and new feature "--"

[AEsir777]

• added tests match3/match4
• added new feature MATCH (n) -- (b) RETURN ...
  • modify '.g4' files
  • add check for 'relDetails' to be nullptr

[andyfengHKU]

Remove /antlr4. and rebase&squash into 1 commits. Then we are ready to merge!

[andyfengHKU]

This is probably where we are different from openCypher standard. Can u additionally comment in the test file as well. Something like # Different result so that we can quickly locate what are the statements to be fixed. Apply this change to match3&4

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (510d804) 90.03% compared to head (9fc716b) 90.03%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2016   +/-   ##
=======================================
  Coverage   90.03%   90.03%           
=======================================
  Files         903      903           
  Lines       32922    32923    +1     
=======================================
+ Hits        29641    29643    +2     
+ Misses       3281     3280    -1     

Files Changed	Coverage Δ
src/parser/transform/transform_graph_pattern.cpp	93.18% <100.00%> (+0.07%)	⬆️

... and 1 file with indirect coverage changes

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