Show the follower's bio/note in a "followed you" notification (#3281)

This makes the notification view for a follow request contain more info about the new follower, and makes the layout (of their name / username) consistent with other notifications that show names/usernames.

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

@@ -28,6 +28,7 @@ data class TimelineAccount(
     @SerializedName("display_name") val displayName: String?, // should never be null per Api definition, but some servers break the contract
     val url: String,
     val avatar: String,
+    val note: String,
     val bot: Boolean = false,
     val emojis: List<Emoji>? = emptyList() // nullable for backward compatibility
 ) {