Add "Scrobbles per hour" chart

android/gradle.properties

assets/translations/en.json

assets/translations/fr.json

fastlane/metadata/android/en-US/changelogs/10.txt

fastlane/metadata/android/fr-FR/changelogs/10.txt

lib/models/counts_by_hour.dart

lib/network/scrobbles_api.dart

lib/ui/screens/main_screen.dart

lib/ui/widgets/main_screen/counts_by_hour_card.dart

lib/ui/widgets/main_screen/counts_by_hour_chart.dart

lib/ui/widgets/main_screen/counts_by_hour_content.dart

pubspec.yaml