Collections Data Explorer

[brandonjackson]

Problem Observations:
Collections are a shared data layer across workflows in a project, but they're a black box — users write and read in code with no way to verify contents.
Items are often 1MB+ in size; logging to state is impractical.
The existing admin page only supports create/edit/delete — there is no way to see what's inside a collection.
Users resort to writing throwaway workflows with collections.get() or using the CLI just to inspect data.

Solution Concepts:
Update Collections UI in project settings
[must have] Download button -> download JSON
[could have] Preview button -> show first 10 records of JSON in a modal