Separate Configuration code into a different function

# Problem

This kind of code is adequate for separate into another function:

https://github.com/jalasem/templatestringparser/blob/29fec424a86ee72110c7f98629989b15df8e9251/index.js#L19-L24

If the current way to manage configuration logic if the options grow in number the code would be larger and you are on risk of breaking the Single Responsibility Principle. Also it makes less obvious the purpose of the function.

# Proposal

**Make configuration lines move to another function**. The logic can be in `settings` function but I suggest a new function instead.

Read index.js lines 19-24, linked in the issue, and identify the configuration logic that should move out of its current function. Extract those configuration lines into a separate function while preserving existing behavior; done means configuration handling is isolated without changing template-string processing.

Written by the indexing model from the issue text.