Fix aliases support for RFLink sensors

[emontnemery]

Description:

Fix aliases support for RFLink sensors

Related issue (if applicable): fixes #16790 and fixes #16703

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

[javicalle]

Thanks for the PR.

[MartinHjelmare]

See the tuya component for how to use our dispatch helper.

[MartinHjelmare]

This should be refactored to use our dispatch helper instead. We should not store entities in a shared dictionary in hass.data. Entities should only be accessed directly from within their own platform.

[akasma74]

@emontnemery & @javicalle Guys, as I can see you are more or less familiar with rflink component, and I' like to ask for some info/help. I run Hass.io 0.83.2 on RPi3 with Arduino Mega flashed with RFLink V1.1 R48

1. I want to create automation that checks that all my key rflink temperature sensors send data at least once every 5 minutes.
   The problem is I cannot rely upon the sensors' last_updated/last_changed attributes as apparently they are changed only when a different data arrives.
   My question is how can get that information, how to listen to 'raw' messages from rflink component?
2. When I recharge batteries and put them back in sensors, some of them remain Unknown in HA GUI. I can see that’s because rflink component picks them under a different name, for example oregonv1_000c_temp instead of oregonv1_0002_temp. So far I ended up adding alternative names as aliases, but it’s marked deprecated on the documentation and I don’t know another way to fix the issue.
3. There is no "friendly_name" attributes for all rflink sensors, and it's a bit inconvenient - does it make sense to file a feature request, or there are any reasons against it?

Sorry for posting my questions here as was unable to get help [elsewhere](url
https://community.home-assistant.io/t/rflink-sensor-aliases-attribute-is-marked-as-deprecated-but-whats-alternative/92676/2)

[MartinHjelmare]

Please open an issue if you suspect a bug. If you need help please use our help channels:
https://home-assistant.io/help/#communication-channels

Merged PRs should not be used for support or bug reports. Thanks!