Merge branch 'v2.3.0release' of github.com:OpenIMSDK/Open-IM-Server into v2.3.0release

# Conflicts:
#	internal/rpc/group/group.go
#	internal/rpc/user/user.go
#	pkg/common/db/mysql_model/im_mysql_model/group_model.go

pkg/common/config/config.go

@@ -106,6 +106,7 @@ type config struct {
 		DBMaxIdle     int      `yaml:"dbMaxIdle"`
 		DBMaxActive   int      `yaml:"dbMaxActive"`
 		DBIdleTimeout int      `yaml:"dbIdleTimeout"`
+		DBUserName    string   `yaml:"dbUserName"`
 		DBPassWord    string   `yaml:"dbPassWord"`
 		EnableCluster bool     `yaml:"enableCluster"`
 	}