Support configuring file extensions for markup formats?

Can we have an option to extend the set of default file extensions to include files which are effectively text but do not use the `.txt` extension? I see https://github.com/NVIDIA/ChatRTX/issues/26 regarding Markdown files, but this is a more general problem; `.tex` (LaTeX), `.bib` (for citations), `.org` (for the Org markup format), and a variety of code extensions _should_ be as visible to the application as any other text file, but are ignored due to their file extension. Given it's near-impossible to make a default list of all the world's different text-file extensions, users need to be able to configure file-extension aliases ourselves, which means we need a UI feature allowing such aliases in the application settings.