Replace CopyDescription with CSVReaderConfig for storage classes.

[andyfengHKU]

We are storing copyDescription* in many storage classes. This is bad because

• life cycle is not guaranteed.
• logic itself should be handled at reader level instead of propagating to storage.

I'm refactoring copyDescription and it touches quite a lot of files. I'm splitting refactor into multiple PRs.

In this PR we replace all copyDescription* with unique_ptr

[codecov]

Codecov Report

Patch coverage: 93.93% and project coverage change: -0.02% ⚠️

Comparison is base (2e460d6) 90.20% compared to head (79f0c5a) 90.19%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2046      +/-   ##
==========================================
- Coverage   90.20%   90.19%   -0.02%     
==========================================
  Files         945      945              
  Lines       33549    33558       +9     
==========================================
+ Hits        30262    30266       +4     
- Misses       3287     3292       +5     

Files Changed	Coverage Δ
src/include/storage/copier/node_group.h	100.00% <ø> (ø)
src/include/storage/copier/string_column_chunk.h	100.00% <ø> (ø)
...age/in_mem_storage_structure/in_mem_column_chunk.h	72.72% <ø> (ø)
src/storage/copier/var_list_column_chunk.cpp	80.95% <66.66%> (+0.22%)	⬆️
src/storage/copier/struct_column_chunk.cpp	33.05% <80.00%> (+0.57%)	⬆️
src/storage/copier/column_chunk.cpp	75.48% <90.90%> (-0.24%)	⬇️
src/include/common/copier_config/copier_config.h	100.00% <100.00%> (ø)
.../include/processor/operator/persistent/copy_node.h	100.00% <100.00%> (ø)
src/include/storage/copier/column_chunk.h	94.11% <100.00%> (+0.11%)	⬆️
src/include/storage/copier/var_list_column_chunk.h	100.00% <100.00%> (ø)
... and 7 more

... and 5 files with indirect coverage changes

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