codeAndLocationFromChildren
This function allows the setting of a node's code and location region as the code and location of its children. Sometimes, when we translate a parent node in the language-specific AST with its children into the CPG AST, we have to set a specific intermediate Node between, that has no language-specific AST that can give it a proper code and location.
While the location of the node is determined by the start and end of the child locations, the code is extracted from the parent node to catch separators and auxiliary syntactic elements that are between the child nodes.
Parameters
Used to extract the code for this node.
The char(s) used to describe a new line, usually either "\n" or "\r\n". This is needed because the location block spanning the children usually comprises more than one line.