Add dev build and development.php file

[HardeepAsrani]

All Submissions:

• Have you followed the Optimole Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

This adds a development.php file to the codebase which loads when you setup the env locally and by default loads the Optimole test constants. It has a constant than you can toggle to use those if you want.

The dev build also includes the development build of React code which should provide more descriptive errors in console.

It also adds the prod & dev build to the Github comments.

Closes #567.

How to test the changes in this Pull Request:

1. When you install build zip from comments, it should work as normal.
2. When you install the dev build zip from comments, it should work as normal too and by default connect to staging site.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[pirate-bot]

Plugin build for 2bb39dd is ready 🛎️!

• Download build
• Download dev

[irinelenache]

@HardeepAsrani Tested and both builds work as expected 🚀

[HardeepAsrani]

Awesome @irinelenache, once this is merged QA team can directly use dev builds when needed to test against staging instead of using the optimole-test repository.

[pirate-bot]

🎉 This PR is included in version 3.8.2 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀