Store creation M2 - domain selection: basic UI integration

[jaclync]

Part of #8045

Description

Domain selection is the first step that I'm implementing for store creation, because profiler questions might be skipped due to API availability (we'll likely have them ready by the end of November and we're okay with skipping profiler questions in M2). This PR includes barebone UI using the existing components like SearchHeader and List, with many design improvements needed as a later subtask to match the latest design since the PR is already big. The empty and loading state design is still TBD and will be implemented in a future subtask.

Major changes include:

• Added a feature flag storeCreationM2 and show the domain selector as the first step of store creation when the feature flag is enabled in StoreCreationCoordinator
• Created two SwiftUI views: DomainSelectorView and DomainRowView with their own view model
  • DomainSelectorHostingController was added as the UIKit wrapper for DomainSelectorView
  • In DomainSelectorViewModel, it loads domain suggestions from the API and updates the observable domains

Testing instructions

• Log in to the app if needed
• Go to the Menu tab
• Tap Switch store
• Tap + Add a store
• Tap Create a new store in the action sheet --> the store picker should be dismissed, then the domain selector should be shown with a very basic UI
• Enter some text to the field --> some domain suggestions should be loaded, and the search query should be highlighted in the domain attributed string
• Select a domain --> the substring that doesn't match the search query should be bold

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• @jaclync tests the store creation flow when the feature is disabled

Screenshots

one-word query	two-word query	two-word query - light mode

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• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-woocommerce]

	Warnings
⚠️	PR has more than 500 lines of code changing. Consider splitting into smaller PRs if possible.

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[wpmobilebot]

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[selanthiraiyan]

It works as described.

LGTM 🚢

[selanthiraiyan]

Nit: I think these test methods should NOT have AuthenticatedWebViewController in their name. 😄

[jaclync]

Good catch! Updated in 15e1319

[selanthiraiyan]

Nice tests. 🎉