Do not force lowercase paths with requires using aliases

[PhantomShift]

The ability to require source files using aliases for paths is useful, but one of the annoyances in the current implementation is that paths are forced to lowercase when checking aliases from .luaurc files. For example, if I set an alias entry "deps": "../../deps", and then deps contains some file that isn't in lowercase like DataHandler.lua, then the following code will fail with the error No file exists at the path 'deps/datahandler'.

local DataHandler = require("@deps/DataHandler")

I note that this is enforced specifically here, which is then appended to the resolved path of the alias here.

My understanding of the relevant RFC for require by alias is that although the alias itself is expected to be treated as case insensitive, any appended paths should be left as-is, such as in the example they provide in the document.

-- Suppose "@src" is an alias for the same directory as "../../../../../"

-- Instead of this:
local result = require("../../../../../HelperModules/graphing")

-- We could have this:
local result = require("@src/HelperModules/graphing")