Add Lua require mode that adheres to the PUC Lua require behavior.

[bainchild]

This is a new require mode that follows the lua/luajit interpreter require behavior, excluding the default search string being different and binary libraries not being included.
There is also a design choice I'd like to get counsel on before this is merged:

• Should the resource file types (txt, json, toml, yaml) be included in the default search string?
  • This is necessary because PUC Lua requires replace .'s in the path with /, before substituting them into the search string, which means you can't have file extensions.
  • If this is chosen to be included, it will establish a priority of extensions: .luau, .lua, .txt, .json, .toml, .yaml. This could cause problems if not considered, or be considered an intentional override mechanism, given that those resource types are transcoded to lua anyway.
  • There is also the problem of a user's lua installation's LUA_PATH environment variable not providing these 4 resource extensions (as they aren't included in the default lua search path).

I am also unsure if I should be contributing the documentation to go alongside this, as I couldn't find any general standards for documentation contribution.

[jeparlefrancais]

Hi 👋 That is all a good start! To answer your questions:

• I would support the file extensions lua and luau for now
• For documentation, look at site/content/docs/path-require-mode/index.md for an example
• Related to the LUA_PATH environment variable, I think it'd be nice if that would be configurable. The require mode could have a field to read the given env variable for the ;-separated list of paths/globs