rollup-plugin-app-utils plugin

[svapreddy]

Awesome Contribution Checklist:

• [x] I have read, and re-read the Contributing Guidelines
• [x] I have searched to ensure the suggested item doesn't exist on this list
• [x] This PR contains only one item

Please Describe Your Addition

rollup-plugin-app-utils helps developers with common tasks. It has an excellent i18n bundler, html injector utility, directory utilities to execute during the build.

Overall, the idea behind this plugin is to provide single plugin to carry out common operations.

[shellscape]

I have read, and re-read the Contributing Guidelines

If you just created something, wait at least 30 days before submitting. This is to give it some time to mature and ensure it's not just a publish-and-forget type of project.