[Feature][ui] user can monitor dolphinscheduler's log by Web UI

Describe the feature

User can view dolphinscheduler self’s *.log file under folder logs by UI without login to Linux server.

i.e those files

dolphinscheduler-alert.log
dolphinscheduler-alert-server-localhost.localdomain.out
dolphinscheduler-api.2021-06-17_05.0.log
dolphinscheduler-api.log
dolphinscheduler-api-server-localhost.localdomain.out
dolphinscheduler-logger-server-localhost.localdomain.out
dolphinscheduler-master.log
dolphinscheduler-master-server-localhost.localdomain.out
dolphinscheduler-worker.log
dolphinscheduler-worker-server-localhost.localdomain.out
gc.log

Is your feature request related to a problem? Please describe.

Some company have no ELK platform to analysis log. Everytime if people want to view log, they need to login Linux server.

Describe the solution you’d like

User can view log by UI.

Describe alternatives you’ve considered

In navbar Monitor, add a item Log manage to sidebar.

在导航栏监控中，添加日志管理到侧边栏.

In Log manage, user can choose master, worker, or alert etc. Then view their log

Additional context

[davidzollo]

@lyn916 no problem, worker doesn’t communicate with Database, only Master and API server does. By the way, you can join our Slack space: https://s.apache.org/dolphinscheduler-slack , any language will be OK in Slack.

[CalvinKirs]

5台40C 256G 物理机做大数据集群，混合部署，数据库使用keeplaived漂移psql，避免不了worker绑定到vip，vip切换后不知道Dolphin有没有问题

hi,are you replying to the wrong one? By the way, for better communication, please use English, deeply thanks