refactor(classifier): model survey task questions as a Map

[eatyourgreens]

Add a Question model to the survey task. Remove types.frozen({}). Model questions as types.map(Question), mapped by the question ID.

Update tests to test a task model, where previously they were testing a task snapshot.

I've also replaced types.frozen({}) with types.map for task.images and task.questionsMap.

Please request review from @zooniverse/frontend team or an individual member of that team.

Package

• lib-classifier/plugins/tasks/survey

Linked Issue and/or Talk Post

• refactor(classifier): survey task Choice model #6087
• refactor(classifier): use a map for survey task characteristics #6086

Part of a group of PRs that remove types.frozen({}) from the survey task, where maps could be used instead.

How to Review

I've used the storybook to test these PRs. Snapshot Wisconsin is also useful as an example of a survey workflow.
https://localhost:8080/?project=zooniverse/snapshot-wisconsin&env=production

Since these PRs are pure refactors, none of the survey task's behaviours should have changed.

Checklist

PR Creator - Please cater the checklist to fit the review needed for your code changes.
PR Reviewer - Use the checklist during your review. Each point should be checkmarked or discussed before PR approval.

General

• Tests are passing locally and on Github
• Documentation is up to date and changelog has been updated if appropriate
• You can yarn panic && yarn bootstrap or docker-compose up --build and FEM works as expected
• FEM works in all major desktop browsers: Firefox, Chrome, Edge, Safari (Use Browserstack account as needed)
• FEM works in a mobile browser

General UX

Example Staging Project: i-fancy-cats

• All pages of a FEM project load: Home Page, Classify Page, and About Pages
• Can submit a classification
• Can sign-in and sign-out
• The component is accessible
  • Can be used with a screen reader BBC guide to VoiceOver
  • Can be used from the keyboard WebAIM guide to keyboard testing
  • It is passing accessibility checks in the storybook

Refactoring

• The PR creator has described the reason for refactoring
• The refactored component(s) continue to work as expected

[coveralls]

coverage: 79.274% (-0.05%) from 79.323%
when pulling edc2ceb on eatyourgreens:refactor-survey-task-questions
into 9a7a630 on zooniverse:master.