Add internal function inOrEqual

[nafraf]

This PR is to solve #2854: "WHERE element IN list - should cast runtime non-list to a single-element list"

The proposed change is to create a new internal function inOrEqual that is called in case of in operator when the second argument is of type property operator.

The function inOrEqual receives two arguments and returns true in the following cases:

1. arg2 is list and arg1 is in arg2
2. arg1 is equal to arg2

[codecov]

Codecov Report

Base: 91.39% // Head: 91.37% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (506a237) compared to base (e05946e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2882      +/-   ##
==========================================
- Coverage   91.39%   91.37%   -0.03%     
==========================================
  Files         272      272              
  Lines       26223    26248      +25     
==========================================
+ Hits        23967    23984      +17     
- Misses       2256     2264       +8     

Impacted Files	Coverage Δ
src/arithmetic/arithmetic_expression_construct.c	93.73% <100.00%> (+0.05%)	⬆️
src/arithmetic/list_funcs/list_funcs.c	99.05% <100.00%> (+0.06%)	⬆️
src/procedures/proc_ss_paths.c	90.40% <0.00%> (-1.75%)	⬇️
src/procedures/proc_sp_paths.c	95.70% <0.00%> (-0.58%)	⬇️

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