Demos 2404 demonstration create edit dialogs

[connor-parke-icf]

Main goal here was to decouple the Create and Edit demonstration dialogs as the components were getting bulky with create vs edit, and approved vs unapproved. So i implemented a refactor. As part of this, i broke up the components into different files, mainly:

• a wrapping component, where user context and an initial demonstration is generated/fetched
• the main dialog component, where states, mutations, and validations are triggered
• a form component, where the actual form html is put
• and finally a couple of hooks for handling the query and mutation.
  The same structure is copied to the EditDemonstrationDialog. Because the package now spans multiple files, i bundled them together into CreateDemonstration and EditDemonstration subfolders.

There should not be any effect on the actual behavior or appearance of these dialogs, just relaxing their hold on each other behind the scenes.

[demos-git-service-account]

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