Link C and C++ API tests against the API-restricted shared library

[benjaminwinger]

First pass at this, mostly to see if it passes CI.

Implements part of #2136.

Various functions needed the KUZU_API annotation. Some of these are fine, such as ~PreparedStatement and StorageDriver, which should be public.

However a number of things which should really be private (e.g. ValueVector::resetAuxiliaryBuffer) had to be added to the exports since they are used in template functions related to the UDF helpers. While the templates themselves can't be moved into source files, we could probably hide some of their implementations, but I'm not sure if that really does anything other than expose something different which really should be private.

I'm also not convinced that ValueVector was really written with external use in mind, as it has various public functions which users probably shouldn't be calling. However it is required for Connection::createVectorizedFunction to work. I've only added KUZU_API to the bare minimum functions, but note that all inline functions (including getData() for direct access to the buffer) would be usable.

TODO:

• InMemOverflowBuffer::allocateSpace could be removed from the exports if the various operation functions are moved into cpp files. Done; I threw them into vector_string_functions.cpp, though I'm not sure if that's ideal. They could have their own files, but the structure of src/function doesn't match src/include/function and I wasn't sure where they should go.

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (37800fe) 89.63% compared to head (e0507dd) 89.67%.
Report is 40 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2153      +/-   ##
==========================================
+ Coverage   89.63%   89.67%   +0.04%     
==========================================
  Files         997      989       -8     
  Lines       35729    35389     -340     
==========================================
- Hits        32025    31735     -290     
+ Misses       3704     3654      -50     

Files	Coverage Δ
src/common/types/types.cpp	92.13% <100.00%> (+0.08%)	⬆️
src/common/vector/value_vector.cpp	95.16% <100.00%> (+0.07%)	⬆️
src/include/common/data_chunk/sel_vector.h	100.00% <ø> (ø)
src/include/common/types/types.h	100.00% <ø> (ø)
src/include/common/vector/value_vector.h	100.00% <100.00%> (ø)
...nclude/function/string/functions/concat_function.h	100.00% <ø> (ø)
...nclude/function/string/functions/repeat_function.h	100.00% <ø> (ø)
...clude/function/string/functions/reverse_function.h	100.00% <ø> (+4.34%)	⬆️
src/include/main/connection.h	100.00% <100.00%> (ø)
src/include/main/prepared_statement.h	100.00% <ø> (ø)
... and 1 more

... and 149 files with indirect coverage changes

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