Add `unique_id` to all rachio entities
Add platform discovery to rachio component
Move config options from switch.rachio platform to the rachio component
* Don't treat typing as an "in-between" module for import order
That was a < 3.5 era thing.
* Tighten scope of some pylint unused-import disables
To avoid isort moving a top level one around, undesirably broadening its
scope.
## Description:
More fixes flagged by pylint 2 that don't hurt to have before the actual pylint 2 upgrade (which I'll submit soon).
## Checklist:
- [ ] The code change is tested and works locally.
- [x] Local tests pass with `tox`. **Your PR cannot be merged unless tests pass**