Workbench-like runtime evironment

[mariajgrimaldi]

Description

Some comments I've gathered from the community survey on the challenges/suggestions section:

Working with the Aspects Instructor Dashboard filter that Cristhian wrote -- it suits that use case well, and provides a powerful example of customizing that area of the LMS, which doesn't get nearly enough developer attention.

But when errors prevented the filter from loading, it could be difficult to debug -- it would just silently fail and not appear in the UI. Improved logging would help, or maybe even a workbench-like runtime environment for quicker dev loops.