fix: storybook parser for addon objects

[jb-0]

Description

When using storybook addons, it's possible to specify an addon as an object. Doing so seems to cause depcheck to output the following:

Missing dependencies
* [object Object]: ./.storybook/main.js

Example config that would result in failure:

addons: [
    "@storybook/addon-essentials",
    "@storybook/addon-a11y",
    {
      name: "@storybook/addon-themes",
      options: {},
    },
  ],

This MR addresses the issue by taking the name property where it exists. Closes #882