Add int8 supported functions

[Ashleyhx]

No description provided.

[codecov]

Codecov Report

Patch coverage: 87.27% and project coverage change: +0.07% 🎉

Comparison is base (678055d) 90.08% compared to head (7d30255) 90.15%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2030      +/-   ##
==========================================
+ Coverage   90.08%   90.15%   +0.07%     
==========================================
  Files         919      919              
  Lines       33248    33364     +116     
==========================================
+ Hits        29950    30078     +128     
+ Misses       3298     3286      -12     

Files Changed	Coverage Δ
src/include/function/built_in_vector_functions.h	100.00% <ø> (ø)
...c/processor/operator/hash_join/join_hash_table.cpp	91.62% <0.00%> (-1.96%)	⬇️
src/storage/copier/table_copy_utils.cpp	74.92% <0.00%> (-0.90%)	⬇️
src/include/function/hash/hash_functions.h	88.00% <50.00%> (-3.31%)	⬇️
src/function/vector_cast_functions.cpp	83.11% <78.94%> (-0.59%)	⬇️
src/include/function/cast/cast_functions.h	97.53% <93.75%> (+0.60%)	⬆️
src/common/types/types.cpp	92.32% <100.00%> (ø)
src/function/aggregate_function.cpp	82.85% <100.00%> (+1.60%)	⬆️
src/function/built_in_vector_functions.cpp	99.40% <100.00%> (+0.01%)	⬆️
src/function/comparison_functions.cpp	90.90% <100.00%> (+11.96%)	⬆️
... and 7 more

... and 7 files with indirect coverage changes

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[acquamarin]

you can merge after the ci passes