refactor(streaming): convert to modules

Import methods rather than call via exports.

imports/requestModel/client.lua

@@ -0,0 +1,33 @@
+---Load a model. When called from a thread, it will yield until it has loaded.
+---@param model number | string
+---@param timeout number? Number of ticks to wait for the model to load. Default is 500.
+---@return number? model
+function lib.requestModel(model, timeout)
+    if not tonumber(model) then model = joaat(model) end
+    ---@cast model -string
+    if HasModelLoaded(model) then return model end
+
+    if not IsModelValid(model) then
+        return error(("attempted to load invalid model '%s'"):format(model))
+    end
+
+    RequestModel(model)
+
+    if coroutine.running() then
+        timeout = tonumber(timeout) or 500
+
+        for _ = 1, timeout do
+            if HasModelLoaded(model) then
+                return model
+            end
+
+            Wait(0)
+        end
+
+        print(("failed to load model '%s' after %s ticks"):format(model, timeout))
+    end
+
+    return model
+end
+
+return lib.requestModel