Refactor notifications to Kotlin & paging (#4026)

This refactors the NotificationsFragment and related classes to Kotlin &
paging.
While trying to preserve as much of the original behavior as possible,
this adds the following improvements as well:
- The "show notifications filter" preference was added again
- The "load more" button now has a background ripple effect when clicked
- The "legal" report category of Mastodon 4.2 is now supported in report
notifications
- Unknown notifications now display "unknown notification type" instead
of an empty line

Other code quality improvements:
- All views from xml layouts are now referenced via ViewBindings
- the classes responsible for showing system notifications were moved to
a new package `systemnotifications` while the classes from this
refactoring are in `notifications`
- the id of the local Tusky account is now called `tuskyAccountId` in
all places I could find

closes https://github.com/tuskyapp/Tusky/issues/3429

---------

Co-authored-by: Zongle Wang <wangzongler@gmail.com>

app/src/main/java/com/keylesspalace/tusky/TuskyApplication.kt

@@ -22,7 +22,7 @@ import androidx.work.Constraints
 import androidx.work.ExistingPeriodicWorkPolicy
 import androidx.work.PeriodicWorkRequestBuilder
 import androidx.work.WorkManager
-import com.keylesspalace.tusky.components.notifications.NotificationHelper
+import com.keylesspalace.tusky.components.systemnotifications.NotificationHelper
 import com.keylesspalace.tusky.di.AppInjector
 import com.keylesspalace.tusky.settings.AppTheme
 import com.keylesspalace.tusky.settings.NEW_INSTALL_SCHEMA_VERSION
@@ -127,12 +127,6 @@ class TuskyApplication : Application(), HasAndroidInjector {
             editor.remove(PrefKeys.MEDIA_PREVIEW_ENABLED)
         }
 
-        if (oldVersion < 2023072401) {
-            // The notifications filter / clear options are shown on a menu, not a separate bar,
-            // the preference to display them is not needed.
-            editor.remove(PrefKeys.Deprecated.SHOW_NOTIFICATIONS_FILTER)
-        }
-
         if (oldVersion != NEW_INSTALL_SCHEMA_VERSION && oldVersion < 2023082301) {
             // Default value for appTheme is now THEME_SYSTEM. If the user is upgrading and
             // didn't have an explicit preference set use the previous default, so the