feat: msg local cache

pkg/common/config/config.go

@@ -258,6 +258,8 @@ type configStruct struct {
 		FriendVerify *bool `yaml:"friendVerify"`
 	} `yaml:"messageVerify"`
 
+	LocalCache localCache `yaml:"localCache"`
+
 	IOSPush struct {
 		PushSound  string `yaml:"pushSound"`
 		BadgeCount bool   `yaml:"badgeCount"`
@@ -370,6 +372,16 @@ type notification struct {
 	ConversationSetPrivate NotificationConf `yaml:"conversationSetPrivate"`
 }
 
+type LocalCache struct {
+	Topic    string `yaml:"topic"`
+	SlotNum  int    `yaml:"slotNum"`
+	SlotSize int    `yaml:"slotSize"`
+}
+
+type localCache struct {
+	Friend LocalCache `yaml:"friend"`
+}
+
 func (c *configStruct) GetServiceNames() []string {
 	return []string{
 		c.RpcRegisterName.OpenImUserName,