updated cpp version to 17

[zussel]

#157 removed occurrences of matador::any and matador::optional and replaced it with std::variant

[codecov]

Codecov Report

Attention: Patch coverage is 85.51136% with 51 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (develop@8256f2e). Click here to learn what that means.

Files	Patch %	Lines
include/matador/sql/value_processor.hpp	74.41%	11 Missing ⚠️
include/matador/utils/convert.hpp	80.00%	8 Missing ⚠️
src/sql/value.cpp	85.45%	8 Missing ⚠️
src/sql/value_processor.cpp	81.81%	6 Missing ⚠️
src/utils/convert.cpp	80.00%	6 Missing ⚠️
src/sql/column.cpp	0.00%	3 Missing ⚠️
include/matador/sql/column_value_visitor.hpp	89.47%	2 Missing ⚠️
include/matador/sql/memory_connection.hpp	0.00%	1 Missing ⚠️
...clude/matador/sql/query_value_column_processor.hpp	94.73%	1 Missing ⚠️
src/db/mssql/mssql_connection.cpp	0.00%	1 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #163   +/-   ##
==========================================
  Coverage           ?   85.78%           
==========================================
  Files              ?      342           
  Lines              ?    14468           
  Branches           ?        0           
==========================================
  Hits               ?    12412           
  Misses             ?     2056           
  Partials           ?        0           

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