add friend relation change events

docs/api/EventType.md

@@ -145,6 +145,49 @@
 
 
 
+### 添加好友
+
+```json5
+{
+  "type": "FriendAddEvent",
+  "friend": {
+    "id": 123123,
+    "nickname": "nick",
+    "remark": "remark"
+  },
+  "stranger": true
+}
+```
+
+| 名字       | 类型   | 说明                                                                            |
+|----------| ------ |-------------------------------------------------------------------------------|
+| id       | Long   | 好友 QQ 号码                                                                      |
+| nickname | String | 好友昵称(值不确定)                                                                    |
+| remark   | String | 好友备注                                                                          |
+| stranger | String | 是否为陌生人添加，若为 `true` 对应为 `StrangerRelationChangeEvent.Friended` 的 mirai 事件，否则为 `FriendAddEvent` |
+
+
+### 好友删除
+
+```json5
+{
+  "type": "FriendDeleteEvent",
+  "friend": {
+    "id": 123123,
+    "nickname": "nick",
+    "remark": "remark"
+  }
+}
+```
+
+| 名字             | 类型   | 说明                                          |
+| ---------------- | ------ | --------------------------------------------- |
+| id               | Long   | 好友 QQ 号码     |
+| nickname         | String | 好友昵称(值不确定)     |
+| remark           | String | 好友备注                          |
+
+
+
 
 ## 群事件
 

mirai-api-http/src/main/kotlin/net/mamoe/mirai/api/http/adapter/internal/convertor/event.kt

@@ -121,6 +121,9 @@ internal suspend fun BotEvent.convertBotEvent() = when (this) {
         member = if (sender.user != null && sender.user is Member) { MemberDTO(sender.user as Member) } else { null },
         args = args.toDTO { it != UnknownMessageDTO }
     )
+    is FriendAddEvent -> FriendAddEventDTO(QQDTO(friend), false)
+    is FriendDeleteEvent -> FriendDeleteEventDTO(QQDTO(friend))
+    is StrangerRelationChangeEvent.Friended -> FriendAddEventDTO(QQDTO(friend), true)
     else -> {
         if(MahContextHolder.debug) {
             MahContextHolder.debugLog.debug { "Unknown event: ${this.javaClass.simpleName}" }

mirai-api-http/src/main/kotlin/net/mamoe/mirai/api/http/adapter/internal/dto/event.kt

@@ -268,6 +268,19 @@ internal data class FriendInputStatusChangedEventDTO(
     val inputting: Boolean,
 ) : BotEventDTO()
 
+@Serializable
+@SerialName("FriendAddEvent")
+internal data class FriendAddEventDTO(
+    val friend: QQDTO,
+    val stranger: Boolean
+) : BotEventDTO()
+
+@Serializable
+@SerialName("FriendDeleteEvent")
+internal data class FriendDeleteEventDTO(
+    val friend: QQDTO
+) : BotEventDTO()
+
 @Serializable
 @SerialName("FriendNickChangedEvent")
 internal data class FriendNickChangedEventDTO(