Feat: Preserve style and comments in Config object

[LucasDedieu]

Description

Currently, the confit library does not preserve comments, formatting, or other stylistic elements when reading, modifying, and rewriting configuration files. This results in a loss of valuable metadata and readability in the saved files.

An ideal solution would be to store style-related information (e.g., comments, indentation, etc.) within the confit.Config object. This would allow the library to reconstruct the original document with only the modified values, preserving the original structure and style.