Factorization aware dp

[andyfengHKU]

This PR changes the set of plans that kept in DP table during enumeration. Previous, we only keep plans with top K (K=50) lowest cost. This PR keeps plans with top 1 lowest cost for each different factorization structure.

The rationale is

Consider a triangle + an edge
MATCH (a)->(b)->(c), (a)->(c), (c)->(d)
First it make sense to close the cycle as early as possible, so (a)->(b)->(c), (a)->(c)  will be handled first with WCOJ. The output factorization structures
[a, b] * [c] , [b, c] * [a] , [a, c] * [b]  (where the second group is unFlat) are considered as homogeneous. So any one could be picked in the DP level 3 for subgraph `(a)->(b)->(c), (a)->(c)`
But then at the next level, there is a clear disadvantage for [a, b] * [c] because further extension undermines the factorization.

This PR also fixes issue #1098 and #1371

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 🎉

Comparison is base (8299c02) 92.76% compared to head (38abd23) 92.78%.

❗ Current head 38abd23 differs from pull request most recent head 3a06d27. Consider uploading reports for the commit 3a06d27 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1384      +/-   ##
==========================================
+ Coverage   92.76%   92.78%   +0.02%     
==========================================
  Files         641      641              
  Lines       22005    22085      +80     
==========================================
+ Hits        20412    20492      +80     
  Misses       1593     1593              

Impacted Files	Coverage Δ
.../include/binder/query/reading_clause/query_graph.h	96.66% <ø> (ø)
src/include/common/types/types.h	100.00% <ø> (ø)
src/include/planner/logical_plan/logical_plan.h	100.00% <ø> (ø)
src/planner/join_order_enumerator.cpp	98.04% <ø> (-0.01%)	⬇️
src/binder/query/query_graph.cpp	96.29% <100.00%> (ø)
...ude/planner/logical_plan/logical_operator/schema.h	100.00% <100.00%> (ø)
src/include/planner/subplans_table.h	100.00% <100.00%> (ø)
src/planner/operator/schema.cpp	78.49% <100.00%> (+4.81%)	⬆️
src/planner/subplans_table.cpp	100.00% <100.00%> (ø)
src/processor/mapper/map_intersect.cpp	100.00% <100.00%> (ø)
... and 2 more

... and 27 files with indirect coverage changes

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