[Dashboard] Reorganize dashboard modules

We should reorganize the dashboard modules to make the structure more clear.

• Actor module
  • The /logical/actor_groups from logical_view.
  • The /logical/actors from logical_view.
  • Update actors from stats_collector.
• Node module is renamed from stats_collector

Also, we can move some control logic out of reporter module, such as /api/launch_profiling

Then, dashboard have these modules: job, actor, node, event, log, tune, reporter…

[edoakes]

@hegdeashwin I’d say any of the issues in the milestones linked by @fyrestone would be a great place to start! Specifically both of these issues should be pretty small in scope:

• https://github.com/ray-project/ray/issues/13890
• https://github.com/ray-project/ray/issues/13889

Also, in general our testing for the dashboard is lacking so a good place to start might be to clean up & add more tests 😃

[fyrestone]

The dashboard provides data for two frontends: the old frontend(default) and new frontend. Here are some dashboard-related works:

• Refine the new frontend, and make it as the default frontend. There are many new frontend related issues that need to be fixed: https://github.com/ray-project/ray/issues?q=is%3Aopen+is%3Aissue+milestone%3A"New+Dashboard+Frontend"
• Improve the dashboard backend: https://github.com/ray-project/ray/milestone/38, more features are going to be contributed to the community after this issue is fixed.

Currently, I am working on the job submission feature, which is also dashboard related: https://github.com/ray-project/ray/pull/15103