refactor(streamingRequest): internal method for request functions

- TS package type inference for request functions.
- Type fix for Lua's waitFor callback.
- Lua request functions cannot return nil.

imports/requestModel/client.lua

@@ -1,23 +1,16 @@
 ---Load a model. When called from a thread, it will yield until it has loaded.
 ---@param model number | string
 ---@param timeout number? Approximate milliseconds to wait for the model to load. Default is 1000.
----@return number? model
+---@return number model
 function lib.requestModel(model, timeout)
-    if not tonumber(model) then model = joaat(model) end
-    ---@cast model -string
+    if type(model) ~= 'number' then model = joaat(model) end
     if HasModelLoaded(model) then return model end
 
     if not IsModelValid(model) then
-        return error(("attempted to load invalid model '%s'"):format(model))
+        error(("attempted to load invalid model '%s'"):format(model))
     end
 
-    RequestModel(model)
-
-    if not coroutine.isyieldable() then return model end
-
-    return lib.waitFor(function()
-        if HasModelLoaded(model) then return model end
-    end, ("failed to load model '%s'"):format(model), timeout)
+    return lib.streamingRequest(RequestModel, HasModelLoaded, 'model', model, timeout)
 end
 
 return lib.requestModel