[IvanStepanok]

Summary

Adds InstanceStore: the single source of truth for the instance catalog and the selected instance. Port of openedx-app-ios#673. Still foundation: nothing in the app reads it yet.

Stacked PR: builds on #511. Please review and merge in order.

Included

• InstanceProvider: read-only access to the selected instance, plus a StateFlow of it (the Android counterpart of iOS's .instanceDidChange notification).
• InstanceStore: holds the catalog in effect and the selection, persisted by key in its own SharedPreferences file and written synchronously, so a switch right before a process kill isn't lost. A single-instance catalog selects its only instance automatically, including after a deselect. A saved key the catalog no longer contains resolves to nothing but stays saved, so the site is selected again if a later catalog brings it back.
• Config.getInstancesConfig() exposes the bundled catalog; Koin registers InstanceStore and InstanceProvider.
• InstanceStoreTest: 10 cases.

Not included

• Any consumer (networking, storage, session lifecycle): later PRs.
• Remote catalog fetch: next-but-one PR.

Testing

• ./gradlew detektAll testProdDebugUnitTest :app:assembleProdDebug

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Note

This is the 2nd pull request of the multi-instance stack.

[openedx-webhooks]

Thanks for the pull request, @IvanStepanok!

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