Copy rdf graph

[andyfengHKU]

This PR rework COPY statement for RDF graph so that all internal tables are copied in one plan.

The plan looks like the following (detailed operators like indexLookup are omitted)

                                CopyRDF
       CopyRel    CopyRel   CopyNode    CopyNode
       Scan       Scan      Scan        Scan

This is an out-of-memory solution where we scan file for each Copy pipeline (in total 4 times).

Note
CopyNodeSharedState is exposed to IndexLookup and Partition in this PR because

• We need to perform lookup before hash index is persist on disk (which happens in WAL).
• We need to know num of nodes before statistics is available (which happens in WAL).

[codecov]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (d591bff) 93.26% compared to head (ef72884) 93.24%.

Files	Patch %	Lines
src/processor/operator/index_lookup.cpp	67.74%	10 Missing ⚠️
src/include/binder/copy/bound_copy_from.h	83.33%	2 Missing ⚠️
src/processor/operator/persistent/copy_node.cpp	85.71%	2 Missing ⚠️
...de/planner/operator/persistent/logical_copy_from.h	83.33%	1 Missing ⚠️
src/planner/operator/logical_operator.cpp	85.71%	1 Missing ⚠️
src/planner/plan/plan_copy.cpp	97.43%	1 Missing ⚠️
...cessor/operator/persistent/reader/rdf/rdf_scan.cpp	96.42%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2602      +/-   ##
==========================================
- Coverage   93.26%   93.24%   -0.02%     
==========================================
  Files        1034     1037       +3     
  Lines       38664    38815     +151     
==========================================
+ Hits        36059    36193     +134     
- Misses       2605     2622      +17     

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