Undirected query for multi-labelled and unlabelled nodes.

[aziz-mu]

This commit finishes up implementing undirected query, and includes support for queries in the form:
MATCH (A)-[N]-(B)
MATCH (A|B|C|..)-[N|M|..]-(E|F|G|..)
MATCH ()-[]-()

This pertains to issue #1522

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (4aae989) 91.84% compared to head (00d9ef4) 91.85%.

❗ Current head 00d9ef4 differs from pull request most recent head e215b71. Consider uploading reports for the commit e215b71 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1552   +/-   ##
=======================================
  Coverage   91.84%   91.85%           
=======================================
  Files         693      693           
  Lines       24912    24924   +12     
=======================================
+ Hits        22881    22894   +13     
+ Misses       2031     2030    -1     

Impacted Files	Coverage Δ
src/binder/bind/bind_graph_pattern.cpp	94.80% <100.00%> (+0.39%)	⬆️
.../include/parser/query/graph_pattern/node_pattern.h	87.50% <100.00%> (+1.78%)	⬆️

... and 2 files with indirect coverage changes

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