[iOS] New import actions wired up

[amddg44]

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Description

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Note

Medium Risk
Adds new password import entry points (file upload flow, Safari export interstitial, and ASCredentialExchange-based imports) that touch secure vault importing and app-wide user-activity handling. Risk is moderate due to new OS-version-gated flows and potential import/UX regressions, but changes are largely additive and guarded by availability checks.

Overview
Enables the new Data Import Hub flow end-to-end: hub screens can now start a file-upload import via a new DataImportFileUploadCoordinator, show a Safari export interstitial, and trigger BrowserKit’s import request from the Safari detail screen.

Adds support for ASCredentialExchange password imports by advertising extension/app capabilities in Info.plist, introducing CredentialExchangeImportHandler to convert ASExportedCredentialData into vault logins, and extending DataImportUserActivityHandler/MainCoordinator to process credential-exchange user activities and present a DataImportSummaryViewController.

Updates existing entry points (autofill login list/settings, bookmarks, main data import launch, and settings legacy provider/view model) to pass required dependencies into DataImportHubViewController and to run consistent “import finished” callbacks/refresh behavior.

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[github-actions]

	Fails
🚫	Please, don't forget to add a link to the internal task

	Warnings
⚠️	PR has 1845 lines of added code (excluding Xcode projects and assets). Consider splitting into smaller PRs if possible.

	Messages
📖	You seem to be updating localized strings. Make sure that you request translations and include translated strings before you ship your change. See iOS and macOS localization guidelines for more information.

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