add smart-paste plugin from the docs (#107)

Co-authored-by: sxyazi <sxyazi@gmail.com>

smart-paste.yazi/main.lua

@@ -0,0 +1,13 @@
+--- @sync entry
+return {
+	entry = function()
+		local h = cx.active.current.hovered
+		if h and h.cha.is_dir then
+			ya.mgr_emit("enter", {})
+			ya.mgr_emit("paste", {})
+			ya.mgr_emit("leave", {})
+		else
+			ya.mgr_emit("paste", {})
+		end
+	end,
+}