Load from csv

[andyfengHKU]

This PR implements the initial version of direct scan of CSV file.

We don't detect header name or data type. All columns are scanned as "columnN" with data type STRING.

[codecov]

Codecov Report

Patch coverage: 95.45% and project coverage change: +0.03% 🎉

Comparison is base (f59d9a8) 90.09% compared to head (d9ef4a8) 90.12%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2052      +/-   ##
==========================================
+ Coverage   90.09%   90.12%   +0.03%     
==========================================
  Files         950      952       +2     
  Lines       34455    34516      +61     
==========================================
+ Hits        31042    31109      +67     
+ Misses       3413     3407       -6     

Files Changed	Coverage Δ
src/include/binder/binder.h	100.00% <ø> (ø)
src/include/parser/transformer.h	100.00% <ø> (ø)
src/include/planner/query_planner.h	100.00% <ø> (ø)
...lude/binder/query/reading_clause/bound_load_from.h	33.33% <33.33%> (ø)
src/binder/bind/bind_reading_clause.cpp	94.36% <90.90%> (-1.56%)	⬇️
src/binder/bind/bind_copy.cpp	92.05% <100.00%> (ø)
src/binder/bound_statement_visitor.cpp	93.93% <100.00%> (+0.18%)	⬆️
src/include/binder/bound_statement_visitor.h	59.09% <100.00%> (+1.94%)	⬆️
src/include/binder/copy/bound_file_scan_info.h	100.00% <100.00%> (ø)
...rc/include/parser/query/reading_clause/load_from.h	100.00% <100.00%> (ø)
... and 11 more

... and 4 files with indirect coverage changes

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