Current setting/version function

[acquamarin]

1. Added db_version("") function which returns the current database version.
2. Added current_setting(settingName) function which returns the value of the setting.

[codecov]

Codecov Report

Patch coverage: 98.41% and project coverage change: -0.01 ⚠️

Comparison is base (7ecf3b4) 91.16% compared to head (7b14038) 91.16%.

❗ Current head 7b14038 differs from pull request most recent head efdf0ba. Consider uploading reports for the commit efdf0ba to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1760      +/-   ##
==========================================
- Coverage   91.16%   91.16%   -0.01%     
==========================================
  Files         769      769              
  Lines       28089    28138      +49     
==========================================
+ Hits        25608    25652      +44     
- Misses       2481     2486       +5     

Impacted Files	Coverage Δ
src/binder/bind/bind_reading_clause.cpp	94.44% <ø> (ø)
src/include/main/client_context.h	100.00% <ø> (ø)
src/main/db_config.cpp	100.00% <ø> (ø)
src/main/client_context.cpp	92.30% <80.00%> (-7.70%)	⬇️
src/function/built_in_table_operations.cpp	83.33% <100.00%> (+5.55%)	⬆️
src/function/table_operations.cpp	100.00% <100.00%> (ø)
src/include/binder/binder.h	100.00% <100.00%> (ø)
src/include/function/table_operations.h	100.00% <100.00%> (ø)
src/include/main/settings.h	100.00% <100.00%> (ø)
src/main/connection.cpp	93.20% <100.00%> (-1.14%)	⬇️

... and 1 file with indirect coverage changes

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