Fix aggregate rel bug

[andyfengHKU]

This PR fix a bug with aggregating rel and add more tests

It also adds an optimization to rewrite COUNT(node/rel) as COUNT(node/rel._ID)

[codecov]

Codecov Report

Patch coverage: 84.00% and project coverage change: +0.03% 🎉

Comparison is base (bc16021) 89.81% compared to head (b061b9a) 89.85%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1987      +/-   ##
==========================================
+ Coverage   89.81%   89.85%   +0.03%     
==========================================
  Files         878      881       +3     
  Lines       32550    32560      +10     
==========================================
+ Hits        29235    29256      +21     
+ Misses       3315     3304      -11     

Files Changed	Coverage Δ
src/binder/bind/bind_updating_clause.cpp	96.18% <ø> (ø)
...inder/bind_expression/bind_property_expression.cpp	87.14% <ø> (ø)
src/binder/expression/expression.cpp	88.88% <ø> (+5.91%)	⬆️
src/binder/expression/function_expression.cpp	100.00% <ø> (ø)
src/include/binder/expression/expression.h	90.00% <ø> (-1.31%)	⬇️
.../function/aggregate/built_in_aggregate_functions.h	100.00% <ø> (ø)
src/include/function/aggregate/count.h	100.00% <ø> (+33.33%)	⬆️
src/include/function/function_definition.h	100.00% <ø> (ø)
src/include/function/vector_functions.h	100.00% <ø> (ø)
src/include/planner/logical_plan/schema.h	100.00% <ø> (ø)
... and 9 more

... and 3 files with indirect coverage changes

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