End of Year: Add modal structure

[ashiagr]

📘 Project: #410

This PR adds a Compose modal bottom sheet that prompts the user to check their End of Year. Design (and tablet) is not covered in this task and will be done in a future PR.

To test

1. Set END_OF_YEAR_ENABLED feature flag to true in base.gradle
2. Run the app
3. ✅ Check that a bottom sheet appears with two buttons: "View My 2022" and "Not Now"
4. ✅ Tap "Not Now" and ensure the bottom sheet collapses
5. Re-run the app
6. When the bottom sheet appears, tap "View My 2022"
7. ✅ Ensure that nothing happens ("View My 2022" is not yet connected to any screen)
8. Rotate the device to landscape mode
9. ✅ Ensure that modal bottom sheet does not collapse and spreads to landscape mode
10. Rotate the device to portrait mode and tap outside the modal view
11. ✅ Ensure that modal bottom sheet collapses
12. Re-run the app
13. When the bottom sheet appears, perform a back gesture or press device back button
14. ✅ Ensure that modal bottom sheet collapses
15. Perform a back gesture or press device back button again
16. ✅ Ensure that app goes to background

Checklist

• Should this change be included in the release notes? If yes, please add a line in CHANGELOG.md N/A
• Have you tested in landscape?
• Have you tested accessibility with TalkBack?
• Have you tested in different themes?
• Does the change work with a large display font?
• Are all the strings localized? - Added to strings xml
• Could you have written any new tests? N/A
• Did you include Compose previews with any components?

[ashiagr]

I've used ModalBottomSheetLayout which is experimental right now and I had to opt-in for ExperimentalMaterialApi. It made things really simple, I also tested it works on older Android versions (API level 23). But let me know if it's a deal breaker.

[mchowning]

I think that's fine. With compose still relatively young I don't think we should be too hesitant about using experimental apis when they make sense because a lot of fairly fundamental stuff still seems to be experimental.

[mchowning]

Looks good! I'm excited that you're starting in on the EOY project. 😄