Live sync Attributes (#553)

* Add test project for tags

* Update rbx_dom_lua and add attributes project

* Add Attributes shorthand; not working

* Update dependencies

* Update rbx_reflection_database

* Update rbx_types and commit attributes snapshot

plugin/rbx_dom_lua/customProperties.lua

@@ -5,6 +5,26 @@ local CollectionService = game:GetService("CollectionService")
 -- The reflection database refers to these as having scriptability = "Custom"
 return {
 	Instance = {
+		Attributes = {
+			read = function(instance)
+				return true, instance:GetAttributes()
+			end,
+			write = function(instance, _, value)
+				local existing = instance:GetAttributes()
+
+				for key, attr in pairs(value) do
+					instance:SetAttribute(key, attr)
+				end
+
+				for key in pairs(existing) do
+					if value[key] == nil then
+						instance:SetAttribute(key, nil)
+					end
+				end
+
+				return true
+			end,
+		},
 		Tags = {
 			read = function(instance)
 				return true, CollectionService:GetTags(instance)