Add request and response types for room key backup

requests.go

@@ -411,3 +411,23 @@ type ReqBeeperSplitRoom struct {
 	Key   string                `json:"key"`
 	Parts []BeeperSplitRoomPart `json:"parts"`
 }
+
+type ReqRoomKeysVersionCreate struct {
+	Algorithm string          `json:"algorithm"`
+	AuthData  json.RawMessage `json:"auth_data"`
+}
+
+type ReqRoomKeysUpdate struct {
+	Rooms map[id.RoomID]ReqRoomKeysRoomUpdate `json:"rooms"`
+}
+
+type ReqRoomKeysRoomUpdate struct {
+	Sessions map[id.SessionID]ReqRoomKeysSessionUpdate `json:"sessions"`
+}
+
+type ReqRoomKeysSessionUpdate struct {
+	FirstMessageIndex int             `json:"first_message_index"`
+	ForwardedCount    int             `json:"forwarded_count"`
+	IsVerified        bool            `json:"is_verified"`
+	SessionData       json.RawMessage `json:"session_data"`
+}

responses.go

@@ -562,3 +562,35 @@ type RespTimestampToEvent struct {
 	EventID   id.EventID         `json:"event_id"`
 	Timestamp jsontime.UnixMilli `json:"origin_server_ts"`
 }
+
+type RespRoomKeysVersionCreate struct {
+	Version string `json:"version"`
+}
+
+type RespRoomKeysVersion struct {
+	Algorithm string          `json:"algorithm"`
+	AuthData  json.RawMessage `json:"auth_data"`
+	Count     int             `json:"count"`
+	ETag      string          `json:"etag"`
+	Version   string          `json:"version"`
+}
+
+type RespRoomKeys struct {
+	Rooms map[id.RoomID]RespRoomKeysRoom `json:"rooms"`
+}
+
+type RespRoomKeysRoom struct {
+	Sessions map[id.SessionID]RespRoomKeysSession `json:"sessions"`
+}
+
+type RespRoomKeysSession struct {
+	FirstMessageIndex int             `json:"first_message_index"`
+	ForwardedCount    int             `json:"forwarded_count"`
+	IsVerified        bool            `json:"is_verified"`
+	SessionData       json.RawMessage `json:"session_data"`
+}
+
+type RespRoomKeysUpdate struct {
+	Count int    `json:"count"`
+	ETag  string `json:"etag"`
+}