add new apis and samples

samples/widgets-sample2.lua

@@ -0,0 +1,13 @@
+local fmt = require "fmt"
+
+function on_resume()
+    local widgets = aio:get_available_widgets()
+    local tab = {}
+
+    for k,v in pairs(widgets) do
+        table.insert(tab, { fmt.bold(v.name), v.type })
+    end
+
+    ui:show_table(tab)
+end
+