Ecommerce Segmentation Survey: Create Survey main component and routing provider

[phcp]

Closes #88920

Proposed Changes

• Create SurveyContainer component: this is the main component that will receive the list of questions and render using the stepper layout and calling pagination functions. It depends on a context that handles pagination, and each survey should implement its own provider.
• Create EcommerceSegmentationSurvey step: this is the Step implementation. Its folder also contains the questions file, where the questions are defined (for now just a mock survey). Under a feature flag ecommerce-segmentation-survey.

TODOs

• Design details not fully covered as part of this PR
• Missing to apply on the e-commerce flow (under a feature flag)

Testing Instructions

• Apply this PR to your local
• Revert the last commit to access the testing route git revert cfe3816
• Go to http://calypso.localhost:3000/ecommerce-segmentation-survey?flags=ecommerce-segmentation-survey
• You should see the mock survey
• You should be able to navigate between the questions (pressing back, skip, and continue)
• You should see the query params updated with the current page
• When loading the page with a predefined a page, the related question should be displayed

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• https://wpcalypso.wordpress.com/devdocs/docs/testing/index.md for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions]

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[matticbot]

This PR does not affect the size of JS and CSS bundles shipped to the user's browser.

Generated by performance advisor bot at iscalypsofastyet.com.

[yansern]

I wonder if we want to know if the questions have been skipped, but this is more on the storing the answers part (cc @JuanLucha).

[JuanLucha]

We want to know, but I'm not sure if we are going to find out by comparing the questions with their answers instead of specifically storing a "skipped" status. Something to think about, indeed.

[yansern]

This is just a mock, but I think the questions should be moved to server-side (cc @JuanLucha).

[JuanLucha]

Indeed, something to think about. I'm doing a test for that at the moment.

[JuanLucha]

Very nice with the changes implemented 👌