Edit what files are counted as "Config" or "Packager" files

Describe your feature request
Basically it’d allow for maybe a new field in .replit like this (hidden could also go under this):

hidden = ["hidden1"] # Files that are hidden
config = ["myconfigfile.toml"] # Files that are similar to .replit, replit.nix
packager = ["mypackagerfile.json"] # Files to do with packagers

What problem(s) would this feature solve?
Let’s say someone was trying to make their own programming language and wanted to make a config file for it, or someone was making a template and it could be configured via a file. They could add it to the required list in .replit and voila.

Explain what you were trying to do when you came across the problem leading to this feature request
I was making a goval server implementation.