feat: easy alternative views

[Kelketek]

Description

This PR makes it easier to test the studio and authoring views from within the workbench. This is already supported, but currently requires you to manually specify the scenario URL. This desire to avoid picking specific views made sense in the context of XBlock's original vision which might not expect there to necessarily be a studio as part of the spec. In practice, the Open edX platform is the only implementation, and is expected to stay that way, so adding some opinionated conveniences helps here.

This also includes a 'notify' function shim for the runtime. Both the LMS and studio have this notify function. We implement it here as logging.

Testing instructions

1. Set up the workbench
2. Install a block you'd like to test
3. Visit the block's scenario
4. Verify you can also load the studio scenario, and the authoring scenario, if present
5. Save, and refresh to verify the state has changed

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[samuelallan72]

@Kelketek 👍

• I tested this: followed test instructions
• I read through the code
• I checked for accessibility issues
• Includes documentation

[Kelketek]

@farhan Would you be up for reviewing this?

[farhan]

@farhan Would you be up for reviewing this?

Changes LGTM, adding some test cases would be great

[Kelketek]

@farhan Added a test for this.

[farhan]

@Kelketek
Do you access to merge it or do you want me to merge it?

[Kelketek]

@farhan I don't have merge rights on this repository. Please merge it if it looks good to you. :)

[farhan]

@Kelketek alright, let me give it a test run on monday, as I am on leaves, after that I will share results or merge it.
Thanks for the contribution!