Add typed-literal storage

[andyfengHKU]

This PR change RDF literal type from STRING to RDF_VARIANT.

An RDF_VARIANT is a physical STRUCT{UINT8, BLOB} where UINT8 stores the type and BLOB stores the actual value. This should be a more performant storage design than STRING.

In this PR we start supporting XSD integer, double, decimal, bool and date.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (d34cefc) 89.17% compared to head (2f4dfaa) 90.26%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2341      +/-   ##
==========================================
+ Coverage   89.17%   90.26%   +1.08%     
==========================================
  Files        1007     1011       +4     
  Lines       32229    32308      +79     
==========================================
+ Hits        28741    29163     +422     
+ Misses       3488     3145     -343     

Files	Coverage Δ
src/binder/bind/bind_copy.cpp	93.75% <ø> (+4.16%)	⬆️
src/binder/bind/bind_ddl.cpp	98.26% <ø> (+24.26%)	⬆️
src/binder/bind/copy/bind_copy_rdf_graph.cpp	100.00% <100.00%> (ø)
src/binder/bind/ddl/bind_create_rdf_graph.cpp	100.00% <100.00%> (ø)
src/common/types/rdf_variant_type.cpp	100.00% <100.00%> (ø)
src/common/types/types.cpp	0.00% <ø> (ø)
src/common/types/value/value.cpp	94.92% <ø> (ø)
src/function/cast_string_to_functions.cpp	99.72% <100.00%> (ø)
src/function/vector_cast_functions.cpp	75.00% <ø> (ø)
...rc/include/binder/expression/property_expression.h	100.00% <100.00%> (ø)
... and 7 more

... and 25 files with indirect coverage changes

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