Replace NotImplementedException with KU_NOT_REACHABLE when possible

[ray6080]

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[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (e0b9a11) 90.45% compared to head (cfc1405) 90.63%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2362      +/-   ##
==========================================
+ Coverage   90.45%   90.63%   +0.18%     
==========================================
  Files        1013     1016       +3     
  Lines       33181    35776    +2595     
==========================================
+ Hits        30013    32427    +2414     
- Misses       3168     3349     +181     

Files	Coverage Δ
src/binder/bind/bind_copy.cpp	98.38% <ø> (+4.50%)	⬆️
src/binder/bind/bind_ddl.cpp	100.00% <ø> (+1.73%)	⬆️
src/binder/bind/bind_updating_clause.cpp	95.41% <ø> (+1.43%)	⬆️
src/binder/binder.cpp	99.22% <ø> (+1.51%)	⬆️
src/catalog/catalog_content.cpp	96.79% <ø> (-2.28%)	⬇️
src/catalog/table_schema.cpp	98.33% <ø> (-1.67%)	⬇️
src/common/copier_config/copier_config.cpp	54.54% <ø> (ø)
src/common/expression_type.cpp	100.00% <ø> (ø)
src/common/file_utils.cpp	80.82% <ø> (-7.64%)	⬇️
src/common/types/blob.cpp	100.00% <ø> (ø)
... and 43 more

... and 5 files with indirect coverage changes

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