新增定时任务封装以及配置自动清理数据库功能

新增
- server/config/timer.go
- server/initialize/timer.go
- server/utils/db_automation.go
- server/utils/timer/timed_task.go
修改
- server/config.yaml
- server/config/config/go
- server/global/global.go
- server/main.go

server/go.mod

@@ -36,6 +36,7 @@ require (
 	github.com/pelletier/go-toml v1.6.0 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/qiniu/api.v7/v7 v7.4.1
+	github.com/robfig/cron/v3 v3.0.1
 	github.com/satori/go.uuid v1.2.0
 	github.com/shirou/gopsutil v3.21.1+incompatible
 	github.com/spf13/afero v1.2.2 // indirect