Notification policy (#4768)

This was so much work wow. I think it works pretty well and is the best
compromise between all the alternative we considered. Yes the
pull-to-refreh on the notifications works slightly different now when
the new bar is visible, but I don't think there is a way around that.

Things I plan to do later, i.e. not as part of this PR or release:
- Cache the notification policy summary for better offline behavior and
less view shifting when it loads
- try to reduce some of the code duplications that are now in there
- if there is user demand, add a "legacy mode" setting where this
feature is disabled even if the server would support it

closes #4331
closes #4550 as won't do
closes #4712 as won't do

<img
src="https://github.com/user-attachments/assets/de322d3c-3775-41e7-be57-28ab7fbaecdf"
width="240"/> <img
src="https://github.com/user-attachments/assets/1ce958a4-4f15-484c-a337-5ad93f36046c"
width="240"/> <img
src="https://github.com/user-attachments/assets/98b0482b-1c05-4c99-a371-f7f4d8a69abd"
width="240"/>

app/src/main/java/com/keylesspalace/tusky/entity/Notification.kt

@@ -26,7 +26,8 @@ data class Notification(
     val id: String,
     val account: TimelineAccount,
     val status: Status? = null,
-    val report: Report? = null
+    val report: Report? = null,
+    val filtered: Boolean = false,
 ) {
 
     /** From https://docs.joinmastodon.org/entities/Notification/#type */

app/src/main/java/com/keylesspalace/tusky/entity/NotificationPolicy.kt

@@ -0,0 +1,47 @@
+/* Copyright 2024 Tusky contributors
+ *
+ * This file is a part of Tusky.
+ *
+ * This program is free software; you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky.entity
+
+import com.squareup.moshi.Json
+import com.squareup.moshi.JsonClass
+
+@JsonClass(generateAdapter = true)
+data class NotificationPolicy(
+    @Json(name = "for_not_following") val forNotFollowing: State,
+    @Json(name = "for_not_followers") val forNotFollowers: State,
+    @Json(name = "for_new_accounts") val forNewAccounts: State,
+    @Json(name = "for_private_mentions") val forPrivateMentions: State,
+    @Json(name = "for_limited_accounts") val forLimitedAccounts: State,
+    val summary: Summary
+) {
+    @JsonClass(generateAdapter = false)
+    enum class State {
+        @Json(name = "accept")
+        ACCEPT,
+
+        @Json(name = "filter")
+        FILTER,
+
+        @Json(name = "drop")
+        DROP
+    }
+
+    @JsonClass(generateAdapter = true)
+    data class Summary(
+        @Json(name = "pending_requests_count") val pendingRequestsCount: Int,
+        @Json(name = "pending_notifications_count") val pendingNotificationsCount: Int
+    )
+}

app/src/main/java/com/keylesspalace/tusky/entity/NotificationRequest.kt

@@ -0,0 +1,26 @@
+/* Copyright 2024 Tusky contributors
+ *
+ * This file is a part of Tusky.
+ *
+ * This program is free software; you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky.entity
+
+import com.squareup.moshi.Json
+import com.squareup.moshi.JsonClass
+
+@JsonClass(generateAdapter = true)
+data class NotificationRequest(
+    val id: String,
+    val account: Account,
+    @Json(name = "notifications_count") val notificationsCount: String
+)