refactor(dialog/alert): allow defining cancel button

Using the same promise type of API that the input dialog is using, if the user closes the dialog via esc or the cancel button the promise will resolve `cancel` otherwise the promise will resolve `confirm`

resource/interface/client/alert.lua

@@ -1,14 +1,23 @@
+local alert = nil
+
 function lib.alertDialog(data)
+    if alert then return end
+    alert = promise.new()
+
     SetNuiFocus(true, true)
     SendNUIMessage({
         action = 'sendAlert',
         data = data
     })
+
+    return Citizen.Await(alert)
 end
 
-RegisterNUICallback('closeAlert', function(_, cb)
+RegisterNUICallback('closeAlert', function(data, cb)
     cb(1)
     SetNuiFocus(false, false)
+    alert:resolve(data)
+    alert = nil
 end)
 
 RegisterNetEvent('ox_lib:alertDialog', lib.alertDialog)