add new apis and samples

samples/widgets-sample.lua

@@ -0,0 +1,28 @@
+local fmt = require "fmt"
+
+function on_resume()
+    local widgets = aio:get_active_widgets()
+    local tab = {}
+
+    for k,v in pairs(widgets) do
+        table.insert(tab, { fmt.bold(v.name), "(un)fold", "remove" })
+    end
+
+    ui:show_table(tab)
+end
+
+function on_click(idx)
+    local widget_num = math.ceil(idx / 3)
+    local action = idx % 3
+
+    if action == 0 then
+        aio:remove_widget(widget_num)
+    elseif action == 2 then
+        aio:fold_widget(widget_num)
+    end
+end
+
+function on_widget_action(action, name)
+    ui:show_toast(name.." "..action)
+    on_resume()
+end