feat: export grouped prompt constants

[travi]

Summary

• add promptConstants to @form8ion/javascript and export it from the package entry point
• replace the flat questionNames structure with grouped prompt-area mappings to match @form8ion/project
• add stable prompt IDs plus unit and integration coverage for the new grouped prompt constants API

Testing

• npm run test:unit:base
• npm run test:integration
• npm test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d77921a) to head (9ebc9ff).

Additional details and impacted files

@@ Coverage Diff @@## beta #1526 +/- ##
=========================================
Coverage 100.00% 100.00% =========================================
Files 108 108 Lines 353 364 +11 =========================================
+ Hits 353 364 +11 

Flag	Coverage Δ
unit	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/project-type-plugin/prompt.js	100.00% <100.00%> (ø)
src/project-type/publishable/bundler/prompt.js	100.00% <100.00%> (ø)
src/prompts/conditionals.js	100.00% <100.00%> (ø)
src/prompts/question-names.js	100.00% <ø> (ø)
src/prompts/questions.js	100.00% <100.00%> (ø)
src/testing/integration/prompt.js	100.00% <100.00%> (ø)
src/testing/unit/prompt.js	100.00% <100.00%> (ø)

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[github-actions]

🎉 This PR is included in version 16.0.0-beta.19 🎉

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

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