Function framework refactor

[acquamarin]

This PR refactors the current testing framework:
TableFunction, AggregateFunction and scalarFunction are implemented using the same base class Function. All function definitions are stored together in the BuiltInFunction class.

Todos:

1. Binder should have a unified design/interface to match functions.
2. Change paramterTypes/resultType in the function definition from LogicalTypeID to LogicalType

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (38b2497) 89.69% compared to head (9121550) 89.66%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2292      +/-   ##
==========================================
- Coverage   89.69%   89.66%   -0.03%     
==========================================
  Files        1027     1023       -4     
  Lines       36078    35449     -629     
==========================================
- Hits        32360    31786     -574     
+ Misses       3718     3663      -55     

Files	Coverage Δ
src/binder/bind/bind_reading_clause.cpp	95.65% <100.00%> (ø)
...der/bind_expression/bind_comparison_expression.cpp	100.00% <100.00%> (ø)
...inder/bind_expression/bind_function_expression.cpp	96.77% <100.00%> (ø)
src/binder/expression_binder.cpp	97.50% <100.00%> (ø)
src/catalog/catalog.cpp	100.00% <100.00%> (ø)
src/catalog/catalog_content.cpp	100.00% <100.00%> (ø)
src/common/expression_type.cpp	87.50% <ø> (+21.78%)	⬆️
src/expression_evaluator/node_rel_evaluator.cpp	100.00% <100.00%> (ø)
src/function/aggregate_function.cpp	90.38% <100.00%> (+2.38%)	⬆️
src/function/built_in_functions.cpp	100.00% <100.00%> (ø)
... and 53 more

... and 1 file with indirect coverage changes

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