WARNING: Just a POC. You're free to modify your setup to test this out.

Summary:
- After this change bench wont generate config for redis_socketio
  instance.
- Instead we set the same port as redis_cache service for use in
  socketio. i.e. both will share same instance.

Code changes:

- Config will have this difference:

```diff
- "redis_socketio": "redis://localhost:12000",
- "redis_cache": "redis://localhost:13000",
+ "redis_socketio": "redis://localhost:13000",
+ "redis_cache": "redis://localhost:13000",
```

- supervisord/systemd wont start redis_socketio service
- for development setups: redis_socketio service is removed from procfile.

Why?

- Currently this redis instance is used only to ship messages from python
to nodejs server... which is largely stateless (only pub/sub channels)
- This change reduces 1 running process. Less resources for this ~= more
  resources for other running things.

TODO:
- [ ] decicisions - should we even do this? this should be optinal?
- [ ] refactor progressbar in frappe
- [ ] Tests - manual, FC, docker, automated
- [ ] "migration" plan

All dependent deployment projects will likely have to refactor their code to drop this service, shouldn't be too much work.
Example: Frappe cloud, Frappe Docker.