Shortest path planning

[andyfengHKU]

This PR introduces new rel types and logical operators for variable-length-rel and shortest-path-rel.

[codecov]

Codecov Report

Patch coverage: 97.75% and project coverage change: +0.02 🎉

Comparison is base (d8856cb) 91.81% compared to head (196d240) 91.84%.

❗ Current head 196d240 differs from pull request most recent head d6a18ba. Consider uploading reports for the commit d6a18ba to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1472      +/-   ##
==========================================
+ Coverage   91.81%   91.84%   +0.02%     
==========================================
  Files         657      661       +4     
  Lines       23010    23140     +130     
==========================================
+ Hits        21126    21252     +126     
- Misses       1884     1888       +4     

Impacted Files	Coverage Δ
src/include/optimizer/factorization_rewriter.h	100.00% <ø> (ø)
src/include/planner/join_order_enumerator.h	100.00% <ø> (ø)
...ical_plan/logical_operator/base_logical_operator.h	100.00% <ø> (ø)
...c/include/planner/logical_plan/logical_plan_util.h	100.00% <ø> (ø)
src/include/processor/mapper/plan_mapper.h	100.00% <ø> (ø)
src/planner/join_order/cardinality_estimator.cpp	96.61% <71.42%> (-3.39%)	⬇️
src/planner/join_order_enumerator.cpp	98.21% <95.65%> (-0.48%)	⬇️
src/binder/bind/bind_graph_pattern.cpp	94.24% <100.00%> (+0.08%)	⬆️
...inder/bind_expression/bind_property_expression.cpp	89.47% <100.00%> (+0.58%)	⬆️
src/include/binder/expression/rel_expression.h	100.00% <100.00%> (ø)
... and 16 more

... and 1 file with indirect coverage changes

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