Fix struct pack bug

[acquamarin]

This PR fixes the struct_pack bug which is caused by inconsistent struct field vector state during query processing.
The solution is that:

1. In functionEvaluator:
   If the parameter vector state is inconsistent with the result vector state, then we create a new structFieldVector and add it to the resultVector. Otherwise, we simply add the parameter vector to the resultVector.2;
2. During queryExecution:
   If the parameter vector state is inconsistent with the result vector state, then we copy the value stored in parameter to structFieldVector.
   a. If the structFieldVector is flat, we copy the value to the curIdx.
   b. If the structFieldVector is unflat, we copy the value to each selectedPosition.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (6c9b8ae) 91.90% compared to head (c3aeb10) 91.92%.

❗ Current head c3aeb10 differs from pull request most recent head 3108a21. Consider uploading reports for the commit 3108a21 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1515      +/-   ##
==========================================
+ Coverage   91.90%   91.92%   +0.01%     
==========================================
  Files         678      678              
  Lines       24439    24458      +19     
==========================================
+ Hits        22461    22482      +21     
+ Misses       1978     1976       -2     

Impacted Files	Coverage Δ
src/expression_evaluator/function_evaluator.cpp	100.00% <100.00%> (ø)
...include/function/struct/vector_struct_operations.h	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

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