Migrate "room" from "kapt" to "ksp" (#3777)

- Add ksp plugin
- Switch room to use ksp instead of kapt
- `ArrayList` -> `List` in a few places to fix errors about unbound generics

app/src/main/java/com/keylesspalace/tusky/components/conversation/ConversationEntity.kt

@@ -89,7 +89,7 @@ data class ConversationStatusEntity(
     val bookmarked: Boolean,
     val sensitive: Boolean,
     val spoilerText: String,
-    val attachments: ArrayList<Attachment>,
+    val attachments: List<Attachment>,
     val mentions: List<Status.Mention>,
     val tags: List<HashTag>?,
     val showingHiddenContent: Boolean,

app/src/main/java/com/keylesspalace/tusky/db/Converters.kt

@@ -102,8 +102,8 @@ class Converters @Inject constructor(
     }
 
     @TypeConverter
-    fun jsonToAttachmentList(attachmentListJson: String?): ArrayList<Attachment>? {
-        return gson.fromJson(attachmentListJson, object : TypeToken<ArrayList<Attachment>>() {}.type)
+    fun jsonToAttachmentList(attachmentListJson: String?): List<Attachment>? {
+        return gson.fromJson(attachmentListJson, object : TypeToken<List<Attachment>>() {}.type)
     }
 
     @TypeConverter

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

@@ -16,7 +16,6 @@
 package com.keylesspalace.tusky.entity
 
 import com.google.gson.annotations.SerializedName
-import java.util.ArrayList
 import java.util.Date
 
 data class DeletedStatus(
@@ -25,7 +24,7 @@ data class DeletedStatus(
     @SerializedName("spoiler_text") val spoilerText: String,
     val visibility: Status.Visibility,
     val sensitive: Boolean,
-    @SerializedName("media_attachments") val attachments: ArrayList<Attachment>?,
+    @SerializedName("media_attachments") val attachments: List<Attachment>?,
     val poll: Poll?,
     @SerializedName("created_at") val createdAt: Date,
     val language: String?

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

@@ -19,7 +19,6 @@ import android.text.SpannableStringBuilder
 import android.text.style.URLSpan
 import com.google.gson.annotations.SerializedName
 import com.keylesspalace.tusky.util.parseAsMastodonHtml
-import java.util.ArrayList
 import java.util.Date
 
 data class Status(
@@ -42,7 +41,7 @@ data class Status(
     val sensitive: Boolean,
     @SerializedName("spoiler_text") val spoilerText: String,
     val visibility: Visibility,
-    @SerializedName("media_attachments") val attachments: ArrayList<Attachment>,
+    @SerializedName("media_attachments") val attachments: List<Attachment>,
     val mentions: List<Mention>,
     val tags: List<HashTag>?,
     val application: Application?,