Add size() alias

[acquamarin]

Closes #2218

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (c604332) 89.58% compared to head (d52b57a) 89.55%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2220      +/-   ##
==========================================
- Coverage   89.58%   89.55%   -0.04%     
==========================================
  Files        1007     1006       -1     
  Lines       36249    36245       -4     
==========================================
- Hits        32475    32459      -16     
- Misses       3774     3786      +12     

Files	Coverage Δ
src/function/built_in_vector_functions.cpp	96.31% <100.00%> (-0.02%)	⬇️
src/function/vector_list_functions.cpp	93.35% <100.00%> (+0.02%)	⬆️
src/function/vector_string_functions.cpp	87.56% <ø> (+0.13%)	⬆️
...nclude/function/list/functions/list_len_function.h	100.00% <100.00%> (ø)
src/include/function/list/vector_list_functions.h	95.08% <ø> (ø)
...function/string/functions/array_extract_function.h	90.32% <100.00%> (ø)
...include/function/string/functions/left_operation.h	100.00% <100.00%> (ø)
...include/function/string/functions/right_function.h	100.00% <100.00%> (ø)
.../include/function/string/vector_string_functions.h	96.00% <ø> (ø)

... and 9 files with indirect coverage changes

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