Add CREATE RDF GRAPH ddl statement

[andyfengHKU]

This is our first PR migrating RDF querying from the prototype implemented by @gaurav8297. It implements

• CREATE RDF GRAPH statement
• refactor create table clause, bound clause & logical operator. We no longer differentiate node/rel/rdf in these classes.

[codecov]

Codecov Report

Patch coverage: 97.04% and no project coverage change.

Comparison is base (9aaff49) 89.78% compared to head (a4d27d8) 89.79%.

❗ Current head a4d27d8 differs from pull request most recent head 50bd660. Consider uploading reports for the commit 50bd660 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #1984    +/-   ##
========================================
  Coverage   89.78%   89.79%            
========================================
  Files         879      876     -3     
  Lines       32438    32565   +127     
========================================
+ Hits        29126    29243   +117     
- Misses       3312     3322    +10     

Files Changed	Coverage Δ
src/include/binder/binder.h	100.00% <ø> (ø)
src/include/catalog/catalog.h	100.00% <ø> (ø)
src/include/catalog/catalog_content.h	100.00% <ø> (ø)
src/include/catalog/property.h	96.00% <ø> (ø)
src/include/parser/transformer.h	100.00% <ø> (ø)
...rc/include/planner/logical_plan/logical_operator.h	90.00% <ø> (ø)
src/include/processor/operator/physical_operator.h	100.00% <ø> (ø)
src/include/processor/plan_mapper.h	100.00% <ø> (ø)
src/include/storage/wal/wal.h	100.00% <ø> (ø)
src/include/storage/wal/wal_record.h	34.66% <0.00%> (-0.95%)	⬇️
... and 34 more

... and 3 files with indirect coverage changes

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