Add rdf literal and literal triples table

[andyfengHKU]

This PR re-model RDF graph as 4 tables:

Resource node table
----------------------
_id, IRI (primary key)
----------------------

Literal node table
----------------------
_id, ID (SERIAL), IRI
----------------------

Resource triple rel table
------------------------
s_id, p_id, o_id (resource)
------------------------

Literal triple rel table
-----------------------
s_id, p_id, o_id (literal)
-----------------------

Model rational

The rational behind separate node table design is because we want to apply typed literal design rather than handling every literal as a STRING. As for separate rel table design, we need to utilize the fact that subject can only be resource. So subject-object join can only happen on resource triple table.

Copy

Copy is divided into 4 steps for simplicity. We will revisit this at the end of RDF development. Copy with one step is certainly doable.

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (fdbcfea) 89.62% compared to head (6aa24bf) 89.48%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2247      +/-   ##
==========================================
- Coverage   89.62%   89.48%   -0.14%     
==========================================
  Files        1018     1021       +3     
  Lines       35838    36003     +165     
==========================================
+ Hits        32119    32219     +100     
- Misses       3719     3784      +65     

Files	Coverage Δ
src/binder/bind/bind_copy.cpp	94.73% <100.00%> (-0.11%)	⬇️
src/binder/bind/bind_ddl.cpp	98.63% <100.00%> (+0.14%)	⬆️
src/binder/bind/bind_graph_pattern.cpp	96.22% <100.00%> (+0.02%)	⬆️
src/catalog/catalog_content.cpp	100.00% <100.00%> (ø)
src/catalog/rdf_graph_schema.cpp	100.00% <100.00%> (ø)
src/common/data_chunk/data_chunk_state.cpp	100.00% <100.00%> (ø)
src/include/binder/binder.h	100.00% <100.00%> (ø)
src/include/binder/copy/bound_copy_from.h	100.00% <100.00%> (ø)
src/include/binder/ddl/bound_create_table_info.h	100.00% <100.00%> (ø)
src/include/common/copier_config/copier_config.h	100.00% <100.00%> (ø)
... and 26 more

... and 11 files with indirect coverage changes

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