Part of #15192

Adds the feature to filter activities by activity type.

The filter bar/chips design is not part of this task.

To test

Filtering by any activity type

1. Open Activity Log
2. Tap "Activity Type"
3. Select just one activity type and tap Done
4. Note that the button label changes to match the activity you selected
5. The results should reflect only activities of the type you selected

Reopening the Activity type screen

1. Tap the Activity type button again
2. The screen should show the activity types right away, without reloading
3. The activity type you selected should be selected
4. Tap "Done"
5. Nothing should happen since you selected the same filter as before

Reseting activity type

1. Click the "X" near the activity type button
2. All activities types should be displayed

Activity type with a date range filter

1. Select a date range that you know will have results, tap Done
2. Tap the Activity Type button
3. Activity types that match your selected date range should appear
4. Select one and tap done
5. Check that the results are from your selected activity type and between your selected range

Multiple activity types

1. Open the Activity type screen again
2. Select more than one activity type and tap Done
3. Check that the button now displays "Activity Type (X)" where X is the number of activity types you selected

Test more!

Please, test other types of combination of date range + activity types. :)

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.